Uni-ball Signo Bit UM-201 Gel Ink Pen Refill - 0.18 mm - Red

This item is no longer available for sale on JetPens.com
The world's thinnest pen now has refills available! Stock up on refills so you can continue taking microscopic notes. Great for the environment, great for your pocket too!
Model NumberUNI UMR12118.15
Weight0.2 ounces
Diameter - Max 6 mm
Ink Color Red
Quantity in Pack 1
Size - Length 12.4 cm
Tip Size 0.18 mm
Tip Type Needle Point

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Customer Reviews

These are awesome! I...
November 6, 2014
Verified Purchase
These are awesome! I bought the pens years ago and found I love them. Sadly, the pens are no longer manufactured. Hurray, for the refills! Thank you Jet Pens!
YES! XD This refill fits...
February 11, 2012
Verified Purchase
YES! XD This refill fits in the 0.28mm red pen body. I bought the 0.28mm red pen and this 0.18mm red refill because the 0.18mm red pen was out of stock (is it out of stock forever? I dunno, but it's a fantastically smooth tiny-writing pen, maybe even better than the black 0.18mm, so buy them while you still can!)