it is a pencil lead,the lead size is 0.5 or 0.7 mm,lead code is B,2B,3B,4B and HB. description:lead setmeaterial:plasticlead size:0.5 or 0.7 mmlead mode:B,2B,3B,4B,HBpacking:12piece*60mm in a tubeg.w.:10kgscustomers' bar code and item no can be stick on tube.