16 Skate Bearings 608 has high speed solid Ceramic Balls, every bearing has a Steel high speed ball retainer, inside them there are Zirconia fibers 7 Ceramic balls, with a non-contact rubber seal, inner and outer races are made of Steel, 7 balls are made of Ceramic Zirconia fibers, each bearing has 2 non-contact rubber seal to protect the bearing from dust or any possible contamination.Material: Chrome Steel Item: 608-2RS Sealed Skate BearingsType: Deep groove ball bearingsClosures: Rubber Seals Inner & Outer Races: Chrome SteelCage: Nylon Balls: 7 Zirconia fibers Ceramic balls Seals: 2 non-contact rubber seal (could be easily removed and reinstalled) Size: 8x 22x 7 mmQuantity: 16 Bearings FITS: CORONO 4WD 3DIFFFITS: TIEMPO (1:8) GAS (SEALED)