"Crusher Lite" wheels are made from Heat Treated 6061-T6 Spun Aluminum. They feature billet CNC machined 6061-T6 centers. These are the strongest sand billet wheel on the UTV market but specifically designed and machined to be LIGHT . Cast wheels will typically crack or "Shatter" on impact due to cast metals being brittle and porous from the manufacturing process. Our wheels are drastically stronger than a cast wheel but if you do experience a sharp high speed impact they will bend and at least not shatter like a cast wheels. They also typically still hold air if bent letting you get home and not leaving you stranded on the trail! This is the reason racers prefer a non-cast wheel.