*Easily exchange graphics:Our new system allows you to easily clip in graphics,upgrade to new graphic for different shows or presentations in a matter of minutes. *Easily re-tension graphics:in case of over-winding of spring mechanism,the turning gear will decouple automatically. *Adjustable height by a telescoping pole,up to 2400mm. *Colors avails for end covers in black,blue,green and orange. The function changing spring force easily works by different ways smart key and sturdy kno