Uni ball R:E 3A 3 color ballpoint pen equipped with heat erasable ink and rotary select knock mechanism.The frictional heat generated by rubbing the drawn lines with the special eraser on the knock part causes a chemical change that makes the ink colorless, so you can erase and rewrite it many times.- Consists of Ballpoint pen Black / Red / Blue (diameter 0.5mm)- Replacement ballpoint core type URR-103-05 is not included.