ITEM NAME:1Piece High Speed 608 Hybrid Ceramic Center Bearing For Fidget Hand Spinner Z a.imagelink a:hover.imagelink {color:#174d96;.Type: Deep groove ball bearing. Bearing Size: 8mm x 22mm x 7mm. Closures: rubber seals (could be easily removed and reinstalled). Balls: steel balls. Cage: Steel. Inner & Outer Races:Carbon Steel.