2.5 x 7 x 3.5 Stainless Steel Ball Bearings Lot of 10 Bearings 2.5 x 7 x 3.5 Stainless Steel Ball Bearings, Bearings are made of Stainless Steel, each bearing has 2 Metal Shield to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.