Most of our ceramic bearing are widely used in the fields of toys,R/C models,fans,precision equipments,micro-motors,fishing ceramic bearing Specifications: 1) Shield / closure: open bearing, Z, ZZ, RS, 2RS 2) Snap ring: N, NR 3) Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7 4) Vibration level codes: V4, V3, V2, V1 5) Internal clearance codes: C2, C3, C4, C5 6) Material: AISI52100, AISI440C, AISI304, AISI316, ceramic 7) Retainer: PTFE, nylon, PEEK or stainless steel