50 Shielded Bearing R168ZZ 1/4x3/8x1/8 inch MiniatureR168ZZ Shielded Ball Bearings 1 4" x 3 8" x 1 8" inch Lot of 50 Bearings R168ZZ Shielded Ball Bearings, Bearings are 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 3 8" x 1 8" 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, Bearings