The Background Paper Drive Set is a pair of adapters that expand and lock securely inside the core of a roll of seamless paper. One adapter has a plastic cog that accepts a plastic drive chain, so that you can adjust the length of your background comfortably, and a tension control so the background doesn't unroll by itself due to gravity. The chain comes with a hanging chain weight to keep it taught. The Background Paper Drive Set mounts to specially made hooks that offer many mounting possibilities.