S699ZZ Stainless Steel Shielded Ball Bearings 9mm x 20mm x 6mm Lot of 10 Bearings S699ZZ Stainless Steel Shielded 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.