1). Product name: high quality pencil lead, pencil core, pencil refill, black lead, graphite lead, graphite core, charcoal lead
2).Hardness of pencil leads:(9H~12B)
9H,8H,7H,6H,5H,4H,3H,2H,H,F,HB,1B,2B,3B,4B,5B,6B,7B,8B,9B,10B,11B,12B
3).Dia of pencil refill: ¦µ2.0mm, 2.2mm, 3.13mm, 3.5mm, 4.0mm or customized
4). Length of pencil core: 185mm
5). Main material of pencil lead: graphite and clay