1) Types:6000,6200,6300, series 2) Corresponding types: 6000 - 6012, 6200 - 6211, 6300 - 6311, 3) Material:GCr15(AISI 52100) 4)Shield/closure: open bearing, Z, ZZ, RS, 2RS, 5) Vibration and noise level: Z1, Z2, Z3 6) Precision level: P0, P6, (ABEC1, ABEC3)