IVY Classic 10962 Chrome Steel Ball Bearings, 3/8-Inch OD x 3/16-Inch ID x 1/8-Inch Thickness, 1/Pouch Shielded ball bearings prevent burning and marring. Manufactured with high temperature lubricant for reliable performance up to 30,000 RPMs Dimensions: Outside Diameter (A): 3/8-inch, Inside Diameter (B): 3/16-inch, Thickness (C): 1/8-inch Sturdy Reusable Pouch