[buy one bucket and get one free/20 in total] black(【买一桶送一桶/共20支】黑色) [buy 1 barrel and get 1 barrel free/20 pieces in total] black +30 pieces black pen refill(【买1桶送1桶/共20支】黑色＋30支黑笔芯) [buy a bucket and get a bucket for free/20 pieces in total] black 16 pieces +2 red pieces +2 blue pieces(【买一桶送一桶/共20支】黑16支＋红2支＋蓝2支) [buy 1 barrel and get 1 barrel free/20 pieces in total] black 16 red 2 blue 2+30 black pen refill(【买1桶送1桶/共20支】黑16红2蓝2＋30黑笔芯) [buy a bucket and get a bucket for free/20 pieces in total] 8 black +6 red +6 blue(【买一桶送一桶/共20支】黑8支＋红6支＋蓝6支) [buy 1 barrel and get 1 barrel for free/20 pieces in total] black 8 red 6 blue 6 + refill 10 pieces each(【买1桶送1桶/共20支】黑8红6蓝6＋笔芯各10支) [buy a bucket and get a bucket free/20 in total] red 10 + black 10(【买一桶送一桶/共20支】红10支＋黑10支) [buy 1 barrel and get 1 barrel free/20 in total] red 10 black 10+30 black pen refill(【买1桶送1桶/共20支】红10黑10＋30黑笔芯) [buy a bucket and get a bucket free/20 in total] red(【买一桶送一桶/共20支】红色) [buy one bucket and get one free/20 in total] blue(【买一桶送一桶/共20支】蓝色) [buy a bucket and get a bucket free/20 in total] 10 red +10 blue(【买一桶送一桶/共20支】红10支＋蓝10支) [buy a bucket and get a bucket free/20 in total] black 10+10 blue(【买一桶送一桶/共20支】黑10支＋蓝10支) [single barrel] black 8 pieces + red 1 piece + blue 1 piece(【单桶装】黑8支＋红1支＋蓝1支) [single barrel] black 4 pcs + red 3 pcs + blue 3 pcs(【单桶装】黑4支＋红3支＋蓝3支) [single barrel] 5 red and black each(【单桶装】红黑各5支) [single barrel] 5 black and blue each(【单桶装】黑蓝各5支) [single barrel] 5 red and blue each(【单桶装】红蓝各5支) [single barrel] black 10 pieces(【单桶装】黑色10支) [single barrel] blue 10 pieces(【单桶装】蓝色10支) [single barrel] red 10 pieces(【单桶装】红色10支) 30 pieces black refill(30支黑色笔芯) 30 blue refill(30支蓝色笔芯) 30 red refill(30支红色笔芯)

0.5mm(0.5mm)