Uni-ball Signo Gel Impact Pen, White Ink. Beloved by artists and crafters alike, Uni-ball Gel Impact Pens are known for its consistent and smooth writing ability. Perfect for mixed media, scrapbooking and other art projects. Create something timeless with the smooth, bold, fade-resistant lines of Gel Impact ink. Signo Gel Impact pens glide over the page with control for a bold, vibrant appeal and have a comfortable grip, so you can create longer whenever inspiration strikes.