Home WRITING CONVEX. Ball pen in aluminium and ABS 🔍 CONVEX. Ball pen in aluminium and ABS Ball pen in aluminium and ABS with twist mechanism and clip. Blue ink. ø11 x 145 mm Add to quote Category: WRITING Tag: Pen Related products WARHOL. Roller pen and ball pen set in metal (91836) GREENY. Ball pen and mechanical pencil set in bamboo (81162) CHESS. Roller pen and ball pen set in metal and carbon fibre (91835) SILVERIO. Ball pen in metal (81170)