Material:Our tire covers are made of polyester,a waterproof fabric, not only dustproof and waterproof, but also sun and corrosion resistant, greatly improving the appearance of the vehicle and keeping the spare tire clean.Spare Tire Cover Sizes: 14inch for Tire Diameter 23.6"-27";15inch for Tire Diameter 27"-29";16inch for Tire Diameter 30"-31";17inch for Tire Diameter 31"-32.6".Before placing an order, please measure your tire diameter first.Easy to Install:Our spare wheel protector is equipped with a nylon rope and buckle, which can be adjusted to size, making it easy to install and remove without the need for any tools. Please note that after installation, you need to tie a knot at the buckle position to ensure a more secure fit trailers, RVs, off-road vehicles, trucks, etc., which can greatly improve the appearance of your vehicle.Service & Note:This Tire Covers Can Keep Wheels In Good Shape And Extend Their Service Life,Please Measure It Before Buy It.If there is any problem with the product, please contact us in time, we will solve the problem for you as soon as possible.