This 100% Steel Head Cage Takes Your Scene to a New Level . Darkness and limited sound, the perfect combination for sensory deprivation This steel head cage will enclose your subs head into darkness. Not only is vision taken away, but it will also deteriorate sound. This combination will create immense sensory deprivation. Steel head cage does have two small holes, one in front and one in back, to keep airflow within the cage. Head cage has two halves that are hinged at the top which allows it to open vertically. Once head is place in and head cage is closed, there are two D-Rings at either side of neck to apply locks. Specifications: , Size: Head cage is 12 inches by 12 inches with options of 5 inch diameter or 6 inch diameter collar. One Size Fits All. , Weight: 15 pounds. Due to the weight of this product we highly recommend having the Head Cage suspended to avoid injury to muscles and or tendons in the neck and shoulders. Note: Locks Not Included.