Bearing Specs: 12mm X 28mm bearings: Fits RockStar Pro, RockStar II, TriSpoke, Twistar, and FiveStar hubs. Only Matrix, Matrix Lite, Matrix Pro, and Matrix II Pro trucks (12mm axle). Set of 8 9.5mm X 28mm bearings: Fits RockStar Pro, RockStar II, TriSpoke, Twistar, and FiveStar hubs. Fits ATS and Vector trucks (9.5mm axle). Set of 8 9.5mm X 22mm bearings. Fits wheels with bearing hole diameters 22mm: Skateboard and Longboard wheels including MBS All-Terrain Longboards wheels. Fits trucks with axle diameter of 9.5mm: ATS 9.5mm and Vector. Set of 8 10mm X 22mm bearings Fits wheels with bearing hole diameters 22mm: Skateboard and Longboard wheels including MBS All-Terrain Longboards wheels. Fits trucks with axle diameter of 10mm. Set of 8
