Unalterable tungsten carbide ball. retractable tip. Tinted pen with rubber grip. 1) conical tip 0,5 mm, line 0,3 mm thin: ink color black-blue-red 2) conical tip 0,7 mm, line 0,4 mm medium: ink color black-blue-red-purple-burgundy 3) conical tip 1 mm roller pen grip.