Maverick Sun"s 8" Light Proof Premium ducting offers superior protection from light contamination. A thick black rubber coating on the outside of the ducting prevents light from entering or escaping from the duct work. The light proof coating also offers superior tear resistance as well. This ducting is offered in a convenient 25" length. The tear resistance and flexible design make it easy to properly vent your grow space to easily maintain your optimal yield producing environment. Don"t forget the worm clamps and filter.