Supply Unit: Single PieceSpecification Compliance: NFHS and NCAAMaterial: Molded LLDPEProvides phenomenal durability, easy installation, and 250 ft-lbs. of impact resistance. Can also be filled with concrete for superior blocking support. Please Note: This item CANNOT ship to P.O. Boxes, APO, or FPO Addresses. It CAN ONLY ship to a Street Address.