This is the refill for the Frixion Ball 3 Pen. You can choose between a set of 3 black or a set of 3 color - black, red, blue. The ink can be easily erased and rewritten multiple times without any wear or tear to the paper. The heat generated by erasing-friction causes the unique thermo-sensitive gel ink to become clear and the ink will disappear from the page. Made in Japan.