Bearing NO.: SMR128C-ZZRings Material: 440C Stainless SteelBalls Material: Si3N4 CeramicInner Diameter: 8mmOuter Diameter: 12mmWidth: 3.5mmPrecision: ABEC-7(P4)Seal Type: Metal ShieldLubrication: Self-Lubrication(No grease or oil)Feature: High speed, Corrosion resistant, Rust prevention, Dry lubrication, insulation.Application: Fishing Reel, RC Car, Mini Tools, Small Motors, Home Appliances, ... etc.SMR128ZZ 8x12x3.5 Hybrid Ceramic Bearing MR128 SMR128C ZZ 8*12*3.5 Ceramic Ball Bearing MR63 MR74 MR83 MR84 MR85 MR103