1.HB high pencil lead 2.Dia of pencil leadls:2.0mm 3.long of pencil leads:185mm 4.international certification ... Prouduct name:High-quality pencil leads;2,Hardness of pencil leads: 4H, 3H, 2H,H,HB,B,2B,3B, ... 4B,5B,6B,7B,8B;3,Dia of pencil ... in the research, development and production of pencil leads, pencil boards, pencil and wedge joint boards, dressed lumbers, semi ...