3 x 7 x 3 ABEC-3 Stainless Steel Ball Bearings Lot of 10 Bearings 3 x 7 x 3 ABEC-3 Stainless Steel Ball Bearings, Bearings are made of Stainless Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.