LimoStudio, AGG1393, (2) x 4PC Photography Video Studio Backdrop Muslin String Holder, Multi-Functional, Helps Securely Tighten Background Easy Adjustment: To Remove Wrinkles and Unevenness Shown on the Muslin Multi-Functional: In the active position, the user can slide the muslin holder up and down the stand to their best interest Superior Quality and Lightweight (Much Lighter Weight of the Traditional Muslin Clamps) Fast Installation / Disassembly Can eliminate most wrinkles and allow the muslin top to be near parallel with the floor