Constructed of the highest quality UV-resistant polyethylene and polypropylene yarns. Uses a specially designed "spine" yarn design to ensure an extremely high-density, artificial grass. Dual-layer polypropylene backing sealed with a high-quality rubber waterproof coating yields outstanding dimensional stability. Laboratory tested for colour degradation, durability, and fire resistance.70 oz. Total weight per square yard. Designed so that the blades will stand upright with or without infill. Can be glued, seamed, or stapled together.