Is this ink waterproof?

Practically all Ball Point pen ink is water proof, for accidental liquids. If you blot it up expeditiously, you should be fine. If your plan is to soak the paper in water to test the ink, well good luck. If you want to take notes during your scuba class find a different instrument.

Where can you find replacement erasers for this?

You should look for it on Amazon with the keyword "Jetstream replacement ink or eraser".

Where can you get refills for this? I can find 0.5mm, but not the 0.38mm.

Here's a link on Amazon. https://smile.amazon.com/Mitsubishi-Jetstream-Multi-Color-Multi-Functional-Ballpoint/dp/B07FHP6RMB/ref=sr_1_31?crid=9GUANE279VEW&keywords=jetstream+0.38+refill&qid=1675186184&sprefix=jetstream+0.3%2Caps%2C72&sr=8-31

How do you get the lead to come out?

The metal "clip" (for lack of a better word) is actually for the pencil lead. I found that out by accident.

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Uni Jetstream Multi Pen 4 and 1, 0.38mm Ballpoint Pen (Black, Red, Blue, Green) and 0.5mm Mechanical Pencil, Body, Navy (MSXE5100038.9)

Uni Jetstream Multi Pen 4 and 1, 0.38mm Ballpoint Pen (Black, Red, Blue, Green) and 0.5mm Mechanical Pencil, Body, Navy (MSXE5100038.9)

Product ID: 429819499

Details

Brand
三菱鉛筆
Colour
Navy
Ink Colour
Multicolor
Age Range (Description)
Adult
Material
Resin

🌈4 vibrant ink colors in one sleek pen

✏️0.5mm mechanical pencil for sharp detail

🖊️0.38mm ultra-fine ballpoint precision

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Description

🖋️ Master your notes with the ultimate multi-tool pen for the modern professional.

ALL IN ONE EFFICIENCY - Switch seamlessly between black, red, blue, green inks and a 0.5mm mechanical pencil—perfect for multitasking pros.
SLEEK NAVY RESIN BODY - Carry professionalism with a stylish, durable navy resin body that fits perfectly in your hand and your lifestyle.
RETRACTABLE CONVENIENCE - No caps, no hassle—quick retractable design keeps your pen ready and your workspace clean.
PRECISION IN EVERY STROKE - Experience ultra-fine 0.38mm ballpoint tips for crisp, clean writing that stands out in meetings and notes.
SMOOTH JETSTREAM INK FLOW - Enjoy buttery smooth writing with Jetstream ink technology that reduces hand fatigue during long work sessions.

The Uni Jetstream Multi Pen 4 and 1 combines four vibrant 0.38mm ballpoint inks and a 0.5mm mechanical pencil in a sleek navy resin body. Featuring smooth Jetstream ink and a retractable design, it’s engineered for precision, convenience, and style—ideal for professionals who demand versatility and performance in one compact pen.

Specifications

Manufacturer	zebra
Brand	三菱鉛筆
Model Number	MSXE5100038.9
Colour	Navy
Closure	Retractable
Material	Resin
Number of Items	1
Size	1 count (Pack of 1)
Ink Colour	Multicolor
Manufacturer Part Number	MSXE5100038.9
Manufacturer	zebra

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