They allow you to stretch the muslin over the legs of the backdrop stand. It has two types of adjustments. First, it's a Velcro strap that offers up to 3 inches of clearance from the stand. When you wrap it around the top of the stand, it fits snugly to the stand post. Next comes the bungee with a clamp. "Spacing after Velcro. These cord clip holders can work effectively from 2" to 11"+ to attach muslin to backdrop stands.
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