Deep Groove Ball Bearings: Miniature ball bearings: 60x,62x,63x,68x,69x, MR, R series; Seal type: open, Z, ZZ, RS, 2RS, etc. ; 6000 series: ZZ, 2RS, open type etc. 6200 series: ZZ, 2RS, open type etc. 6300 series: ZZ, 2RS, open type etc. 6800 series: ZZ, 2RS,open type etc. 6900 series: ZZ, 2RS,opentype etc. 1600 series: ZZ, 2RS,open type etc. 16000 series: ZZ, 2RS,open type etc. non-standard type: 60/20, 60/28, 60/32, 62/22, 62/28, 62/32, 63/22, 63/28, 63/32.