Check the listing for details. Magnum 52 XLS High Speed Bearing set. Condition: New. Listed at 8.47 USD. Picture is for bearing type only Picture is for engine type only Magnum 52 XLS High Speed Bearing set Front Bearing: R6ZZ 3/8 X 7/8 X .281 Bearing Rear Bearing: 6902 High Speed Bearing RCBearings Magnum high speed two stroke rc engine bearings offer dependable, long lasting smoothness. These have as good or better performance than what came standard in your engine at a fraction of the cost of OEM bearings! These have a high speed plastic retainer from Japan in the rear bearing. NOTE: These rc bearings are appropriate for Heli engines. All heli engines .40ci and above should use a rear bearing with a high speed plastic retainer! Beware of other sellers that try to pass off cheap standard bearings with metallic retainers for your expensive heli engine! Support Email if you dont know which bearings you need or if you are looking for a kit we dont already have.