Earth Start Hydroponic Diamond Foil Film 4' x 25' Reflective Material 11 Mil Thick 48" Wide, 25' Long Features a textured "diamond pressed" surface which not only reflects light but also disperses it evenly eliminating "hot spots" of light that could be harmful to the health of your plants Ideal for lining walls, ceilings, and floors of a growing area in order to optimize light distribution and quality Waterproof film discourages algae and mold growth