Mike's Smoothie wheel covers look great on vintage trailers. They have a beautiful polished finish ...look like a round mirror. These moon hubcaps are chromed solid steel with a 360° steel retention system which is a continuous part of the hub cap (all one piece). They really clamp onto your wheel. These are very solid, all steel caps, not the cheap flimsy variety found elsewhere! Fits standard steel wheels. Don't miss our 15 inch cone-style moon wheel covers!