8-Pack Skateboard Bearings - Bronze Cage Sealed Black8 Skateboard Bearings 608 2RS BRONZE Cage Black Color Set of 8 skateboard ball bearings, the set has 8 Oil Preserved deep groove sealed Black Ball Bearings with BRONZE cage. The Bronze material is one of the least friction and it is a cupper alloy, less friction means less heat and higher speeds. Bearings are sealed with 2 Rubber Seals, Made from high strength chrome steel for durability and performance, features dual rubber seals for enhanced