1.pencil lead 2.black lead color of pencil 3.185mm of lead of pencil 4.Tested by EN71-3, ASTM-F963 ... Hardness8H,7H,6H,5H,4H,3H,2H,H,HB,B,2B,3B,4B,5B,6B,7B,8B,9B ... in the research, development and production of pencil leads, pencil boards, pencil and wedge joint boards, dressed lumbers, semi ... more products. In 2007, our output of graphite pencil lead accounted to 8.3 percent of China's total ...