ESDDI Heavy Duty Spring Clamps Clip Muslin/Paper Photo Studio Backdrops Background-6 Pack(Black) High-strength Spring Clamps: Front gasket with bottle, soft and non-slip, widely applicable to studio photography and video photography Made of Nylon Materials:Its durable and lightweight Jaws 2.4-inch: Fit most standard-size brackets Clamps feature textured surface :It provides gripping power and ensures that clamp won't slip out of your hand while clamping onto larger objects Guarantee:Warranty 12 months