BL551活动铅笔
铅芯规格：0.5/0.7/0.9/1.3/2.0mm
三角笔杆符合人体工程学原理，舒适握杆，书写流畅。
2.0mm规格的活动铅笔，笔杆顶部配有嵌入式卷笔刀。
BL551P mechanical pencil
lead size：0.5mm/0.7mm/0.9mm/1.3mm/2.0mm
The triangular barrel offers the best touch feeling,and accords with ergonomic principles,and top part of barrel has a pencil sharpener.
