Promaster Muslin Backdrop Clips (10 Pack) MPN 9443 PROMASTER SystemPRO Muslin Backdrop Clips are ideal for hanging muslin or other cloth backdrops. The clips are a two part device, one side fits inside the other to firmly affix even the most delicate fabrics without damage. Use from 3 to 10 clips for a 10' wide background to create different draping effects.