2 Pairs (4 bearings) 3/32 Inch Axle Slot Car Flanged Ball Bearings, size is 3/32" x 3/16" and these are metal shielded bearings, bearings are made of Stainless Steel and has Ceramic balls, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, bearings are pre-lubricated with grease.