S6700ZZ Stainless Steel Ball Bearings 10mm x 15mm x 4mm 10 Ball Bearings Pack of 10 S6700ZZ Stainless Steel Bearings, S6700ZZ Bearings are made of Stainless Steel, each S6700ZZ bearing has 2 metal shields to protect the moving elements from dust or any possible contamination, bearings are pre-lubricated with grease.