10 Flanged bearings Wheel Ball Bearings for many applications, this is a popular size that could be used in many RC Cars and Trucks or any application that uses this size 3mm x 6mm x 2.5mm with Flange. Bearings are made of Chrome Steel, each bearing has 2 Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.