Product Features To support various load scenarios,Reail-SlIM Thin section ball bearings are available in three basic types: radial contact (type C), angular contact (type A), and fourpoint contact (type X) and in a variety of sizes ,or series (e.g., KA, KB, KC, etc.). Reail-SlIM Thin section ball bearings are available with various separator options to space the rolling elements uniformly and prevent contact between them.