Material: The wheel frame is made of high-quality aluminum alloy die-casting, with surface spray treatment. The wheel core is made of high-quality reinforced PP, and the tread is made of high-quality PU. Features: The CC series central control caster is a classic best-selling model of hospital bed caster. Its aluminum alloy wheel frame has unparalleled load-bearing capacity and impact resistance compared to other materials, and the surface of the wheel frame is treated with spray coating, making it beautiful and not easy to change color. The tread is made of PU material with excellent wear resistance and corrosion resistance, greatly extending the service life of the casters.