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TRB RC 8pcs. 3x6x2mm Open Precision High Speed Ball Bearing, Ceramic Hybrid. Chrome Steel 52100 (GCr15) Races with Ceramic Si3N4 Balls. Part SKU# TRB-MR63/C Chromium Steel Races Ceramic Si3N4 Balls Low Torque Start Up Dimensions as follows: ID, OD, Width: 3x6x2mm This Bearing Can be Used to Replace Part #: Blade - E-Flite EFLH2215 Traxxas Alias 6642 Dromida Ominus DIDE1114 The Characteristic of Ceramic Balls Compared with steel, ceramic materials are noted for their better or particular characters, such as wear-resistance, corrosion resistance, high temperature resistance, electrical insulation (except SiC), non-magnetic, high strength, high rigidity, and low specific gravity. These properties qualify them for replacing steel to make bearings serve in conditions of higher speed, harsh environment and less lube, and decrease wear, noise, vibration and maintenance time of bearings, and eventually increase performance, reliability and life of bearings. Ceramic materials, which can be used in making bearings, include mainly silicon nitride, ZrO2, alumina (Al2O3), and silicon carbide.