The Panda Film Waterproof Black & White 10' x 25' provides reliable light control and surface protection for hydroponic grow environments. This durable 5.5 mil polyethylene film features a white side that reflects light back toward plants to help improve coverage and a black side that blocks light to reduce algae growth and light leaks. The waterproof construction makes it suitable fo... https://www.hydroponicstown.com/811125-black-white-film-10-x25-5-5mil