Ball Bearings for OS Engines FSR 108 (bx-1) 108Ball Bearings Kit for OS Engines FSR 108 (bx 1) Double Rubber Sealed Set of 2 Chrome Steel ABEC 1 This bearing kit is made specifically for OS Engines FSR 108 (bx 1) and includes two rubber sealed ball bearings built to handle heat, vibration, and RPMs in model engines. With corrosion resistant materials and low friction grease, it's a smooth and reliable fit for RC engine rebuilds. Includes 2 rubber sealed bearings Designed for OS Engines FSR 108 (bx