Lot of 50 688ZZ Shielded Ball Bearings 8mm x 16mm x 5mm Lot of 50 688ZZ Shielded Ball Bearings, 1/8 Scale Axle OFNA Metal Bearings, this is a popular size that could be used in many Radio Control Cars and trucks. 688ZZ 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.