1. Material: Gcr15 high chrome bearing steel (AISI52100) 2. Grade: G200, G100, G16, G10, G5 Size: 1.5mm 3. The main steps to produce the ball: Heading, , polishing, heat treament, grinding, lapping, packing 4. Used for small size deep groove bearing, like 688zz, 689zz, 6800zz, 6801zz, 6802zz, 6803zz and etc. Packing Term: Carton/ Wooden case Size: 31cm x 23cm x 16.5cm Net weight: 20kg Gross weight: 22kg Payment Term: T/T Product Feature good hardness, excellent wearing, high precision. Application / Models Used for small size deep groove bearing, like 688zz, 689zz, 6800zz, 6801zz, 6802zz, 6803zz and etc. miniatuer motor.