This product has a complex structure, the mold in the upper and lower left and right direction each have a side slider. Between the product features, parts of the original parts of the original has a small-rounded corners, which is not conducive to the formation of parts. Wheels are maden of magnesium alloy that is known as the lightest metal structure material, with high specific strength and specific rigidity, excellent machinability and so on. Due to the fact that the wheels of magnesium alloys are light, they provide good safety and maneuverability. The special structure of the metal makes it possible to experiment with its form and design without losing products strength and quality. In recent years, magnesium alloy has attracted wide attention from all over the world, as the most promissimg lightweight material for key research, and developed a seried of technology to promote the magnesium alloy in the transport, aerospace and defense industry applications.