50 Shielded Bearing R4ZZ 1/4x5/8x0.196 inch MiniatureR4ZZ Shielded Ball Bearings 1 4" x 5 8" x 0. 196" inch Lot of 50 Bearings R4ZZ Shielded Ball Bearings, Bearing is Metal, this is a popular size that could be used in many Radio Control Cars and trucks and applications that uses this size 1 4" x 5 8" x 0. 196" inch. 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. Item: R4ZZ