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 ...
It marks the origin of the pen knife. Before 1850, the process for vulcanization of rubber had not been discovered, and the only way to correct a writing mistake was to scratch the ink off the ...
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.