Emart Photo Video Studio 9.2 x 10ft Heavy Duty Background Stand Backdrop Support System Kit with Carry Bag for Photography The kit include: (4) x 1.1 inch Diameter crossbar / (2) x 9.2ft Heavy duty aluminum alloy light stand / (2) x 4.5 inch Heavy duty spring clamps / (1) x Heavy duty portable carry bag. This kit is a professional heavy duty support (The maximum can withstand 30 lbs backdrops), Aluminum Alloy Construction for Durability, Portability. Let you control what you want can be a very good height (adjustable from 3.8 ft to 9.2 ft) and width (adjustable from 5 ft or 10 ft) Holds Canvas, Muslin, or Paper. Two clamps combine ergonomic with advanced technology to provide comfortable grip to you, can prevents background slippage. The background support system is easy to install and uninstall for your convenience. The heavy duty portable carry bag for your easier carry and store.