683ZZ Shielded Ball Bearings 3mm x 7mm x 3mm 10 Bearings 683ZZ Shielded Ball Bearings, the inner diameter is 3mm, outer diameter is 7mm and the width is 3mm, Bearings are made of Chrome Steel, each bearing has 2 Metal Shielded to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.