5 x 8 x 2.5 Shielded Ball Bearings Lot of 10 Bearings 5 x 8 x 2.5 Shielded Ball Bearings, Bearings are made of Chrome Steel, this is a popular size that could be used in many RC Cars and Trucks like Traxxas and Tamiya, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.