DL Light Proof Ducting is strong, durable, and as the description indicates...light proof. That means that when properly installed no light will penetrate the ducting and disrupt your plants' lights out schedule. The ducting is also durable with multiple layers of inner liners to protect from punctures from sharp objects. DL Light Proof Ducting is available in 4", 6", 8", 10", and 12" diameter. — Ships from DL: Livermore, California USA. Specifications for 10'' Light Proof Black Ducting dl-430010: | | EACH Packaged | CASE | PALLET | UPC: | 816731019323 | | | Volume: | | | | Dimensional Weight: | | | | Weight (lbs): | 7 | | | Approx Length (inches): | 14 | | | Approx Width (inches): | 10 | | | Approx Height (inches): | 10 | | | |