Kraco CN6704 ECOpremium Multi-Seasonal Recycled Black Rubber Mat Set with Raised Protective Border - 4 Piece Plays an active role Made from recycled materials which reduce the amount of waste deposited into landfills The production lot is computer controlled to guarantee consistent material quality Chemists continually perform statistical sample analysis for cure characteristics, tensile strength, density, UV light and ozone exposure specifications Features sure-grip nib backing