The Black Turbosound ts-pc18b-1 is a water-resistant protective cover, which provides the Turbosound iQ18B and select 18" Subwoofers (without casters mounted) with a degree of protection from inclement weather, dust, and dirt, while on the road or in dusty storage environments. It features a rugged, multi-layer nylon outer material and a thick interior foam padding, both of which guard against scratches and minimize moderate impacts during transport.