6700 10PCS ABEC-5 2RS 10x15X4mm Miniature Rubber Seal Deep Groove Ball Bearing
ABEC-3:The size accuracy is less than 0.01mm, the hand feels smooth, the speed is less than 6000rpm, the noise is low, and the service life is long. ABEC-1 :The size accuracy is less than 0.05mm.