TRB RC 5x11x4mm Ceramic Ball Bearings Hybrid Seals (2) Description TRB RC 5x11x4mm Precision High Speed Ball Bearing, Ceramic Hybrid. Chrome Steel 52100 (GCr15) ABEC 5 Races with Ceramic Si3N4 Grade 5 Balls, Hybrid Seals, Each Bearing Contains 1 Low Contact Rubber Seal, 1 No Contact Metal Shield. Part SKU TRB-MR115-RZ/C Chromium Steel Races Ceramic Si3N4 Balls Low Torque Start Up Dimensions as follows: ID, OD, Width: 5x11x4mm This Bearing is Compatible with Part : Axial: AXA1221 Arrma: AR610019 Losi: LOSA6947 HPI: B022 Tamiya: 58041, 58354, 58056 Compatible with Traxxas: 4611, 5116 Team Associated: 25239, 25618 The Characteristic of Ceramic Balls Compared with steel, ceramic materials are noted for their better or particular characteristics, 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. Features: Hybrid Seals: Each Bearing Contains 1 Low Contact Rubber Seal and 1 Metal Shield Product Details: Brand: TRB RC Material: Alloy Steel Item Weight: 4.54 Grams Bearing Number: RC Bearing Type: Ball Bearing Package Dimensions ‏ : ‎ 5 x 4.5 x 0.1 inches; 0.16 Ounces Date First Available ‏ : ‎ September 14, 2014 Manufacturer ‏ : ‎ TRB RC Best Sellers Rank: #636,939 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #7,033 in Deep-Groove Ball Bearings #7,033 in Deep-Groove Ball Bearings Customer Reviews: 5.0 5.0 out of 5 stars 3 ratings