This item is made of carbon steel， great replacement for the broken or missing steel balls on the bearing wheel.
Ideal accessory parts for bicycle repairing use and rebuilding your bicycle's bottom bracket.
Applications would include casters， conveyors， roller skates， bicycles， overhead trolleys， drawer slides， garage doors and door locks.
Wholesale purchase would be more preferential.
Material: carbon steel
Color: sliver tone
Diameter: 4mm / 0.16"
Please allow a bit manual measuring errors.
240 x 4mm Bicycle Ball Bearings