It is called the HeatVanish Pen and works by using heat sensitive ink that turns clear when hot. The pen is equipped with an electric heating element on the end which works as your rubber.

The Pilot G2 is infallibly smooth, vibrant, and ergonomic—and right now it’s on sale, too.

The Think Ink Pen is designed for people who fidget. It flexes with spring-like resistance, has a magnetic ball for sliding, and a spinner for your thumb to roll around. Think Ink was fully funded ...