... ,3.0mm,4.0mm,7.2mmHardness4H, 3H, 2H,H,HB,B,2B,3B,4B,5B,6B,7B,8BLength184.5mmColorBlackUseWriting, drawingCertificationEN71-3 ... markets throughout the world.The company's new automated manufacturing line have helped to control product manufacturing costs and improve overall ...