These Fender Covers provide your car with protection from scrapes, scratches and grease when working under the hood. They are made of non-slip material to prevent it from sliding off of slippery surfaces and also keep the tools from slipping off. They have a soft feel and is cushioned for protection. The strong PVC product is reinforced with nylon mesh and is completely washable. It is unreceptive to motor oil, coolant, lacquer thinner, brake fluid, etc. and will not damage your car paint. The 24" X 60" fender cover is approximately 1/4" (6.35mm) thick and does not require any mounting brackets or hooks to use.