TRB RC 4pcs 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/Cx4

Chrome Steel 52100 (GCr15) ABEC 5 Races
Ceramic Si3N4 GR 5 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.