6800ZZ Shielded Ball Bearings 10mm x 19mm x 5mm 10 Ball Bearings 6800ZZ Shielded Ball Bearings, these bearings are made of Chrome Steel, this is a popular size that could be used in many RC Vigor helicopters, RC Cars and Trucks, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.