uni Jetstream 4&1: Multi Pen Refills, Sizes & Pencil
The uni Jetstream 4&1 (MSXE5-1000) is a Mitsubishi Pencil multi pen with black, red, blue and green Jetstream ballpoints and a 0.5 mm mechanical pencil in one 148.8 mm (5.9 in) body. It comes in 0.38, 0.5 and 0.7 mm, takes SXR-80 refills, and The Journal Shop lists it as made in Japan.
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Product facts
- Product
- uni Jetstream 4&1 Multi Pen (0.38 / 0.5 / 0.7 mm + 0.5 mm pencil; MSXE5-1000)
- Brand
- uni-ball
- Brand origin
- Japan
- Made in
- Japan*
- Material
- Plated brass front barrel, coated ABS resin rear barrel, rubber grip, steel clip (per Wafuu and bungu.store)
- Released
- November 2008*
- Price range
- $$$5–20 per pen (multi-packs divided by the count)
Notes on these facts
- Made by Mitsubishi Pencil Co., Ltd.. Made in Japan: The Journal Shop lists Japan as the country of origin for the 0.5 mm 4&1. Mitsubishi Pencil's Japanese product page and press releases don't state it. Source. Price: example listing. Released: Mitsubishi Pencil's February 17, 2011 press release says the Jetstream 4&1 first came out in November 2008.
- Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
Key takeaways
- Five tools in one: black, red, blue and green Jetstream ballpoints plus a 0.5 mm mechanical pencil, worked by pressing the clip.
- Retailers list the body at 148.8 mm (5.9 in) long, 13.7 mm across and about 24 g (Wafuu 23.6 g, JetPens 24 g).
- Ink refills are SXR-80 in three ball sizes: SXR-80-38 (0.38 mm), SXR-80-05 (0.5 mm) and SXR-80-07 (0.7 mm).
- Mitsubishi Pencil's reference price in Japan is ¥1,100 (about US$7) including tax; SXR-80 refills are ¥110 (about US$0.70).
- A Lite touch ink version, the MSXE5-LS-05, went on sale in Japan from March 18, 2024, at ¥1,430 (about US$9).
What is the uni Jetstream 4&1?
The Jetstream 4&1 is a multi pen from Mitsubishi Pencil with four Jetstream ballpoint colors and a 0.5 mm mechanical pencil in one body. The model is MSXE5-1000, and the inks are black, red, blue and green. Mitsubishi Pencil’s 2011 press release says the 4&1 first came out in November 2008, and The Pen Addict was reviewing a 0.7 mm “Jetstream 4+1” by September 2010.
It’s a long-running enthusiast favorite: Gentleman Stationer says he uses one daily and owns five or six, and it’s our multi-pen pick in best pocket pens. Its ink is the same low-viscosity Jetstream ink as the single uni-ball Jetstream RT.
uni Jetstream 4&1 specs
| Spec | Value |
|---|---|
| Maker | Mitsubishi Pencil Co., Ltd. (Tokyo) |
| Model | MSXE5-1000-38 · -05 · -07 |
| Ink colors | Black · red · blue · green (Jetstream low-viscosity oil-based ink) |
| Ball sizes | 0.38 · 0.5 · 0.7 mm |
| Pencil | 0.5 mm lead, worked by the clip |
| Ink refill | SXR-80-38 · SXR-80-05 · SXR-80-07 |
| Length | 148.8 mm (5.9 in), per bungu.store and Wafuu (The Journal Shop: 147.6 mm) |
| Diameter | 13.7 mm, per bungu.store, Wafuu and The Journal Shop (JetPens: 15.0 mm max) |
| Weight | 23.6 g (Wafuu); 24 g (JetPens) |
| Body | Plated brass front, coated ABS rear, rubber grip, steel clip (retailers) |
| Price in Japan | ¥1,100 (about US$7) including tax |
| Body colors (Japan) | 9 standard, per Mitsubishi Pencil’s December 2025 release, plus limited colors |
| JAN (0.5 mm black) | 4902778120699 (order code MSXE510005.24) |
| First released | November 2008 (Mitsubishi Pencil) |
| Made in | Japan (per The Journal Shop) |
Mitsubishi Pencil’s Japanese product page publishes the sizes, pencil lead, codes and price; the size, weight and materials come from retailers. Mitsubishi Pencil renewed the lineup with new standard body colors from December 1, 2025; Japanese body colors aren’t always sold in the US, so check the listing.
How do you switch colors and use the pencil?
Each ink color has its own slider at the top; the pencil comes out when you press the clip. The Pen Addict explains that pushing the clip down brings out the 0.5 mm pencil, and pressing it again advances the lead.
The same reviewer found the clip the weakest part of the pen in a 2021 review: it rattles a little, and its spring tension is a compromise between clipping and clicking.
What refills does the Jetstream 4&1 use?
It takes Mitsubishi Pencil’s SXR-80 Jetstream refill, in the same ball size as the pen. The codes are SXR-80-38 (0.38 mm), SXR-80-05 (0.5 mm) and SXR-80-07 (0.7 mm), each sold in black, red, blue and green. Mitsubishi Pencil lists them at ¥110 (about US$0.70) each in Japan.
Gentleman Stationer notes that SXR-80 refills also fit the Jetstream 3&1. Stationery World lists one SXR-80-05 refill at 0.7 g, so a spare or two weighs next to nothing in a pen case.
Which Jetstream 4&1 size should you choose?
Pick 0.5 mm for most handwriting, 0.38 mm for planners and small notes, and 0.7 mm for a smoother, darker line. A finer ball lays down less ink, so it also smears less on thin paper.
uni-ball markets Jetstream ink as quick-drying, which is why the single Jetstream is our ballpoint pick in best pens for left-handed writers. We haven’t timed the 4&1 refills ourselves.
What is the Jetstream 4&1 Lite touch?
It’s a 4&1 with Mitsubishi Pencil’s lighter-writing Lite touch ink, model MSXE5-LS-05. Mitsubishi Pencil rolled it out in Japan from March 18, 2024, in 0.5 mm with a 0.5 mm pencil and five body colors, at ¥1,430 (about US$9). Its SXR-L80-05 refills cost ¥132 (about US$0.80), and Mitsubishi Pencil says Lite touch refills also fit existing Jetstream bodies.
There is also a metal-bodied Jetstream 4&1 Metal, which The Pen Addict reviewed in April 2024.
How does the Jetstream 4&1 compare to a single Jetstream?
The 4&1 gives you four colors and a pencil; a single Jetstream is slimmer and shorter.
| Jetstream 4&1 | Jetstream RT | |
|---|---|---|
| Inks | Black, red, blue, green + 0.5 mm pencil | One color |
| Sizes | 0.38 · 0.5 · 0.7 mm | 0.5 · 0.7 · 1.0 mm |
| Diameter | 13.7 mm | 11.8 mm barrel |
| Length | 148.8 mm | 141.4 mm |
| Refill | SXR-80 | SXR-5 · SXR-7 · SXR-10 |
| Made in | Japan (The Journal Shop) | Japan (spec sheets) |
If you only need one color in a hybrid-ink ballpoint, the Pilot Acroball is the other common choice.
Where is the uni Jetstream 4&1 made?
The Journal Shop lists the Jetstream 4&1 as made in Japan. Its spec sheet gives Japan as the country of origin for the 0.5 mm model. Mitsubishi Pencil’s Japanese product page and press releases don’t state it.
How much does a Jetstream 4&1 cost?
It falls in our $$ band ($5–20 per pen) in the US. Mitsubishi Pencil’s reference price in Japan is ¥1,100 (about US$7) including tax; imported pens from US shops such as JetPens also fall in the $$ band.
Frequently asked questions
What refill does the Jetstream 4&1 use?
Mitsubishi Pencil's SXR-80 Jetstream refill in the matching size: SXR-80-38 for 0.38 mm, SXR-80-05 for 0.5 mm and SXR-80-07 for 0.7 mm, in black, red, blue or green. The same refills fit the Jetstream 3&1.
How do you use the pencil on a Jetstream 4&1?
Press the clip. The Pen Addict explains that pushing the clip down brings out the 0.5 mm pencil, and pressing it again advances the lead; each ink color has its own slider.
What lead does the Jetstream 4&1 take?
Standard 0.5 mm mechanical pencil lead, per Mitsubishi Pencil and retailer listings.
How long is the Jetstream 4&1?
bungu.store and Wafuu list it at 148.8 mm (5.9 in) long and 13.7 mm across; The Journal Shop lists 147.6 mm and JetPens 14.8 cm. Mitsubishi Pencil doesn't publish a length. It's longer and wider than a single-color Jetstream.
Where is the uni Jetstream 4&1 made?
The Journal Shop lists Japan as the country of origin for the 0.5 mm model. Mitsubishi Pencil, which is based in Tokyo, doesn't state it on its product page.
What is the Jetstream 4&1 Lite touch?
A version with Mitsubishi Pencil's lighter-writing Lite touch ink, model MSXE5-LS-05, rolled out in Japan from March 18, 2024 at ¥1,430 (about US$9). Its SXR-L80-05 refills also fit existing Jetstream multi pens, per Mitsubishi Pencil.
Is the Jetstream 4&1 worth it over separate pens?
If you switch colors often, yes: one body replaces four pens and a pencil. The trade-offs are a wider 13.7 mm barrel and a clip that The Pen Addict found rattly.
Sources
- ジェットストリーム 多機能ペン 4＆1 MSXE5-1000 (Mitsubishi Pencil Japan product page, read in full: 0.38, 0.5 and 0.7 mm, 0.5 mm pencil, order codes, JAN, ¥1,100 (about US$7) including tax)
- 『ジェットストリーム 4＆1』ブライトシリーズ (Mitsubishi Pencil press release, February 17, 2011: 4&1 first released November 2008)
- 『JETSTREAM 多機能ペン 4&1』新軸色発売 (Mitsubishi Pencil press release: new body colors from December 1, 2025)
- 『ジェットストリーム 多機能ペン 4&1』2025年12月1日（月）新軸色発売 (Mitsubishi Pencil via Digital PR Platform: 9 body colors, SXR-80 refills, Jetstream 100 million pens a year)
- 『JETSTREAM Lite touch ink』搭載モデル2024年3月18日（月）より順次店頭展開開始 (Mitsubishi Pencil: MSXE5-LS-05, SXR-L80-05 refill)
- bungu.store: uni Jetstream 4&1 multifunction pen (148.8 × 13.7 mm; brass front barrel, ABS rear)
- Wafuu: uni Jetstream multi-function pen 4&1 MSXE5-1000 0.5 mm (148.8 mm, 23.6 g, steel clip)
- The Journal Shop: Mitsubishi uni Jetstream 4&1 0.5 mm (147.6 mm, 13.7 mm, country of origin Japan)
- JetPens: uni Jetstream 4&1 0.5 mm, navy body (14.8 cm, 15.0 mm max, 24 g)
- JetPens: uni Jetstream 4&1 multi pens (category)
- Gentleman Stationer: SXR-80 multi pen refills (fit 4&1 and 3&1)
- Stationery World: uni Jetstream SXR-80-05 refill (0.7 g; fits MSXE5-1000-05)
- The Pen Addict: uni Jetstream 4&1 Metal multi pen review (clip works the pencil), April 10, 2024
- The Pen Addict: uni Jetstream 4&1 0.38 mm review (clip rattle), March 25, 2021
- The Pen Addict: uni-ball Jetstream 4+1 0.7 mm review, September 20, 2010
- Gentleman Stationer: Pen review, uni Jetstream 4&1 multi pen (May 8, 2024)