6700ZZ Shielded Ball Bearing 10mm x 15mm x 4mm 6700ZZ Shielded Ball Bearing, 6700ZZ bearings is a popular size that could be used in many RC Cars and Trucks,6700ZZ Bearings is made of Chrome Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also 6700ZZ bearing is pre-lubricated with grease.