Photo Studio Backdrop Support System, 10ft x 7ft/3m x 2.1m、10ft x 8.5ft/3m x 2.6m、10ft x 10ft/3m x 3m Three Optional Sizes, Adjustable Background Stand with 6 Spring Clamps, 6 Backdrop Clips, 2 Sandbags, and Carrying Bag, for Portrait/Studio Photography/Photo Video Party Ceremony/Balloon Party Decorations