Features 500 PCS STEEL BALLS: the carbon steel ball kit contains 500 carbon steel balls with a diameter of 9 mm, a sufficient quantity, easy to use and replace, perfect replacement for old or bad ones. Carbon steel: the steel ball for bearing is made of high quality carbon steel material with high hardness and rigidity, exquisite workmanship, smooth and delicate appearance, durable and long service life. Shiny surface: these carbon steel balls have a smooth mirror surface without burrs or bumps, making them safe and reliable in operation, 100% brand new, high quality, reliable and safe in quality. GOOD PERFORMANCE The solid balls are finely machined, these solid steel balls have standard size and good rigidity, stable performance and strong practicality. Wide application: these 9mm steel balls are a good replacement for bearing fixings for industrial equipment and I believe that they will make your life easier. Specification: Item Type: Steel Balls Material: carbon steel. Diameter: approx. 9 mm / 0.35 inches. Applicable: storage accessories. Package list: 500 x steel balls. Note: Store in a dry or airtight place. Package List 500 x Steel Balls