6203-2RS Sealed Ball Bearings ATV Wheel Bearing Lot of 10 Bearings 6203-2RS Sealed Ball Bearings, the inner diameter is 17mm, outer diameter is 40mm and the width is 12mm, Bearings are made of Chrome Steel, each bearing has 2 Blue Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.