“笔芯”的英语？

能不能请给这支圆珠笔每种颜色配两根替换笔芯?Can you give me two refill of each color for the ballpoint pen?这款圆珠笔备有丝绒笔套,内里的笔芯质量卓越,并可更换.It comes in a velvet and the high - quality refill can be replaced.他给他的圆珠笔换了一支笔芯.He got a refill for his bal...