2 x 7 x 3 Shielded Ball Bearings Lot of 10 Bearings 10 Bearings Wheel Ball Bearings for many applications, this is a popular size that could be used in many RC Cars and Trucks. Bearings are made of Chrome Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.