The Recoil Bass Blockers BB-T are designed to enhance car audio and video installations by providing a solution for controlling bass frequencies. With the brand being Recoil, known for their quality products in the vehicle electronics and GPS category, these bass blockers are sure to enhance the overall audio experience in a vehicle. The specific design of the BB-T model focuses on limiting low frequency noise, allowing for a clearer and more enjoyable listening experience while on the road. package contains 2 bass blockers 1 for each speaker