Editorial Review TRB RC 10pcs 12x18x4mm Precision High Speed Ball Bearing, Chrome Steel 52100 (GCr15) ABEC 3 with Rubber Seals Blue. Part SKU# TRB-6701-2RS-BU Chrome Steel 52100 (GCr15) ABEC 3 Races Hard Chrome Steel 52100 (GCr15) BallsRubber Seals to Help Fight Dirt Great Quality & Value For Applications Dimensions as follows: ID, OD, Width: 12x18x4mmThis Bearing Can be Used to Replace Part #:Losi: LOSA6956HPI: B033Traxxas: 5120Team Associated: 91155