Product Description:Product Name: Steel BallMaterial: GCr15 bearing metal (Chrome steel)Rating: G10Hardness: >60HRCSize: 7mm-9.525mmFeatures: high hardness, wear resistance, smooth surface, good roundness, challenging to rust.Applications: Widely used in high-speed bottom noise bearings, motors, hardware, wrought iron, equipment parts, bicycles, motorcycles, automobiles, precision instruments, clinical equipment, fishing gear, toys, rails, common ball, luggage, electronics industry, also Can be used as a grinding media. Commonly utilized in precision package akin to ball screw, slider guide, linear bearing!The records is for reference only, there will be some errors, please talk to the particular product!Remarks: If you've got particular needs, please contact us, we can customize according to your needs!Package Include:According for your Choose x 1