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Polished multiple times, perfectly rounded. Standard size, uniform size. Precision machining Safety and environmental protection, excellent quality. Application - For a wide range of applications such as bearings, automotive parts, bicycles, valves, rollers, door locks, machinery, etc. › See more product details; Product description Material: carbon steel. Standard size, uniform size. Polished multiple times, perfectly rounded. Safety and environmental protection, excellent quality. No oil, safety and environmental protection, excellent quality.; Product description Material: carbon steel. Standard size, uniform size. Polished multiple times, perfectly rounded. Safety and environmental protection, excellent quality. No oil, safety and environmental protection, excellent quality.; Material: carbon steel. Standard size, uniform size. Polished multiple times, perfectly rounded. Safety and environmental protection, excellent quality. No oil, safety and environmental protection, excellent quality.