Razor Phase Two Solid Alloy Core Wheel - Silver/Black Phase Two 110mm pro wheels are the fastest, smoothest-rolling wheel with super low resistance for a superb ride 110 mm solid alloy core wheels with high grade polyurethane 88A hardness rating Equipped with Swiss style free-running RZR Pro 50 bearings Comes in a one pack and features a solid alloy core with Razor logo laser etched in the hub Compatible with any scooter that accommodates 110mm wheels