Ardinbir 3x Chain Drive Photography Background Backdrop Support System with Hooks, Rollers and Chains - Wall or Ceiling Mounted This Expan Background Drive Set inserts into 3 paper/muslin/cloth background rolls. The chain assists in raising and lowering the background. Comes complete with 3 plastic drive chains(color may varied). They can be fixed to a wall or ceiling It is very easy working with full length background paper/muslin/cloth. The expans fit into each end of the tubes, then fit firmly onto the wall hooks. Using the Expans on triple hooks will enable you to hang three rolls of paper/muslin/cloth. Fabric cores or Metal/PVC tubing are NOT included