... promotional purpose, good quality and competitive price ceramic USB1. ceramic USB is clean , clear and lubricative, 2. its craft is ... uncredible diffcult due to barrel is made of ceramics in 1.3mm,3. the tolerance between pen body and ceramics barrel ... procedures such as moulding, artwork printing and etc. Process methods:1.according to ancient craft, after bisque firing, enamelling, glaze firing ...