european standard gel pen carbon black business office exam special student learning stationery water pen conference signature pen 欧标中性笔碳素黑色商务办公考试专用学生学习文具水笔会议签字笔

black [one pack]] red [one pack]] blue [one pack]] black [12 boxed]] red [12 boxed]] blue [12 boxed]] black refill red refill blue refill

0.5mm needle head 0.5mm bullet