The VTACK™ 4025 Duct Hang Strap is manufactured from a premium grade only 100% Polyethylene Fiber, constructed with a strong 9 x 9 weave and for extra strength coated with a tough PE film on both sides. The 4025 is Fire Retardant, UV stable and will not fade in direct sunlight, it is waterproof, washable and mildew resistant. Ideal for supporting flexible duct work and all other ideal industrial applications.