Webra 61 Fs Speed 61 Econo Power RC Engine Bearings WEBRA 61 FS SPEED 61 Econo Power RC Engine Bearings QTY. 1: R6-ZZ/W.2188C (0.3750x0.8750x0.8750 IN)  QTY. 1: MR6902-ZZC (15x28x28 MM)