Associated Nitro TC3 Ball Bearings for NTC3 Set of 28 Bearings Bearings have Ceramic Balls Complete set Ball Bearings for Associated Nitro TC3 , Set Contains 28 Bearings these Bearings have Ceramic Balls. Each bearing has Closed (Seals) to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.