uniball™ Erasable Gel Pens, Medium Point (0.7mm), Business Colours, 4 Pack, Erasable Gel Retractable Pens

Enjoy a smooth-writing gel pen that erases cleanly and easily! The R:E features heat-sensitive ink that turns invisible when exposed to heat by rubbing it with the plastic friction "eraser" in the pen's push button. The friction eraser produces no dust when used and doesn't wear out. A special mechanism in the push button locks it in place when the pen is turned upside down, letting you erase as hard as you want without clicking the pen.