Engine Bearings with Re-enforced Nylon (Polymite )Cages.
This special design can withstand higher load than normall,re-enforced cage can use on higher speed and heavy duty.
This Ball Bearing designed to be a direct replacement for the bearing in many .21-.28 Nitro Engines. This bearing is specially designed to withstand high RPMs that exist in this application.
This bearing is an open design to allow the oil from the fuel to keep the balls well lubricated.