6002-2RS Sealed Ball Bearings 15mm x 32mm x 9mm 6002-2RS Sealed Ball Bearings, the inner diameter is 15mm, outer diameter is 32mm and the width is 9mm, this is a popular size and are used in many electric scooters, Bearings are made of Chrome Steel, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.