Guaranteed for six(6) full years from date of purchase 1/2" thick 100% recycled polyethylene...very durable and can be recycled as well. Withstand 60 ton loads. Reuse hundreds of times...virtually indestructible Field tested in record heat and cold Less expensive than fiberglass Last years longer than plywood...and no splinters Proven best diamond plate design Black mats are UV resistant White Mats protect lawns from sun brown-out Easy to handle with Handi-Hook Lock mats together with Turn-A-Links