Neewer 6-Pack Set Black Muslin Spring Clamps Clips 3.75"/9.5cm for Photography Studio Backdrops Backgrounds Woodworking Essential Item in Any Studio Setup. Ideal for Photo Video Studio & Home or Office. Moveable clamp teeth to hold muslin or objects tightly. Small teeth on the inner diameter hold muslin cloth or paper backdrops in place for photo work. Used for clipping paper, canvas and muslin backdrops to a crossbar.