The Wall or Ceiling Mount Expand System holds up to 4 aluminum tubes (2 1/2” Diameter). This Chain Driven Manual Lift System is great for supporting Seamless Paper and Light Weight Muslin Backdrops. Metal Chains are recommended for support of canvas-type backdrops. The Aluminum Tubes are not included with the system and may be purchased separately. If backdrops are purchased at the time the system is ordered, we will mount the backdrops on the aluminum tubes for FREE!. *If rollers are added to system, the shipping will be (T) for Truck.