TRB RC 6x12x4mm Precision High Speed Ball Bearing, Ceramic Hybrid. Chrome Steel 52100 (GCr15) ABEC 5 Races with Ceramic Si3N4 Grade 5 Balls, Hybrid Seal with 1 No Contact Metal, 1 Low Contact Rubber Seal Yellow. Part SKU# TRB-MR126-RZ/Cx2-YEChromium...