Ball Bearings 5x19x6 10 Bearings 635ZZ 10 Bearings Wheel Ball Bearings for many applications, this is a popular size that could be used in many applications that uses this size 5mm x 19mm x 6mm. 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.