1.SIZE: mostly 6000sere is(6000~ 6010,620 0~6210,6 300~6310 ) 2. Seal Type: Open Style, Z, ZZ, RS, 2RS, 2RZ 3. Material: Chrom Steel (GCR15) or High Carton Steel (GCR11) 4. Accuracy Lever: ABEC-1(P0), ABEC-3(P6) 5, Retainer: Iron, Cooper, Stainless Steel 6. Rings and Balls Hardness: 59-62 HRC 7.Features: 1).Because of their versatility and single row, deep groove ball bearings are the most popular of all ball Bearing types. 2). Raceways of both rings are deep groove type and curvature slightly larger than that of ball. These Bearings can handle mainly radial loads, but they can also handle certain degree of axial loads in either direction. These Bearings are simple in construction and are suitable for high speed operation. Contact Info Tel:+86-531-86300180 Email: prsb_chian@hotmail.com Skype: yyli_china Website: http://www.nstb.cn