1.High Performance,Long life 2,Competitive price 3,Quick delivery,good service 4,skate bearing As a professional skateboard bearings manufacturer, we ... other sizes as well,include 6900zz(10x22x6mm),688zz(8x16x5mm).2,ToleranceLevels of our skate bearings include ABEC-1, ABEC-3, ABEC-5 ...