I can't be certain if the ink is waterproof, but I do know that a form I'd filled out unfortunately got wet and the ink didn't run. I hope that helps.

Anyone know what refills to get for these pens?

Dear Amanda P,Thank you for choosing Newell Rubbermaid Office Products. Our goal is to provide our customers with the highest quality and service. The uni-ball signo 207 Medium Point Black refills will fit in these pens. The item number for this is 70207PPThank you,Newell Rubbermaid Office Products

ASIN	B0002LD1VC
Best Sellers Rank	#223 in Office Products ( See Top 100 in Office Products ) #14 in Gel Ink Pens
Date First Available	August 7, 2008
Is Discontinued By Manufacturer	No
Item Weight	0.478 ounces
Item model number	33960PP
Manufacturer	Uni-Ball
Product Dimensions	0.65 x 3.7 x 7.55 inches

Uni-Ball Signo 207 Retractable Gel Pen, Medium Point, Black Ink, 4-Count

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