Uni ball R:E 3 BIZA 3-color ballpoint pen that can be erased.Slim but with plenty of ink. Knurled metal grip for easy-to-grip and stylish design.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)(Rotation select knock mechanism)