These zirconia ceramic balls contain yttria for compressive strength, so they won’t crack or lose shape when pushed together.

The addition of molybdenum gives 316 stainless steel excellent corrosion resistance. Use it in a variety of marine and chemical-processing applications.

Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.

Also known as nylon 6/6, this general purpose material is often used for bearings, gears, valve seats, and other high-wear parts.