... -3, ASTM F963-08, ST2002-3 [Pencil To WritePromotional School Kit 1, the pencil lead is made ... , Unique production process and pencil lead is difficult to break. 5, packaging: bulk or DIY design by ... pencil lead manufacturer.7, the leads are used to wooden pencil, paper pencil, woodless pencil, golf ... This kind of product has long-term exportrd to Japan market! The quality has reached Japanese standard ...