mechanical pencil lead,the resin fine lead is made from the compound resin and hinghly pure graphite and other materials. Adopt Japanese technology and ... equipments, supply high quality Hi-polymer pencil lead refill.Used for writing ... ,0.7mm,0.9mm,1.3mm and1.8mm-2B rectangle lead.Hardness:H,HB,B,2B,3B,4B,5B,6B and ...