sketching pencil wholesale 2 b4b8b12 b charcoal pencil hard medium soft charcoal pen sketch pen for painting factory refill wooden 素描铅笔批发2B4B8B12B炭笔硬中软碳笔绘画用素描笔工厂笔芯木制

7h one 3h one 5h one f one b one 2b each 4b one 5b one one piece of 6b one 8b 10b each 12b one 14b each soft charcoal pieces medium carbon pieces hard charcoal pieces

as shown in the figure