3/32 Inch Slot Car Axle Stainless Steel Flanged Premium ABEC-5 Ball Bearing with Si3N4 Ceramic Balls (Silicon Nitride) Stainless Steel Flanged Ball Bearing with Ceramic Balls Premium ABEC-5 quality, this is a popular size that be used in Slot Car Axle and many application. Bearing is made of Stainless Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, Ceramic Balls are the highest standard of balls that can make your bearings live at least 5 times more than any other bearings.