The J&T Bearing Associated RC8B4.1 Endurance Bearing kit is perfect for those looking to upgrade from stock kit bearings, or serious racers on a budget. Even at a value price, these bearings are still packed with features! Polished Steel Balls, āJā Type ball retainer, grease filled, ABEC 5 rated, and rubber seals create a bearing kit that offers the features racers need at a price racers can appreciate. This kit is compatible with the Associated RC8B4.1.