The RollGRIP Media Clamp is handy storage solution that simply snaps on to rolls of material. Keep your inventory neat and tidy. Tape and rubber bands can damage print media, but RollGRIP's won't. The 4.5" diameter clamp is suitable for full rolls (roughly 50 yards) and down to half rolls. The 3.5" diameter clamp is suitable for half rolls and smaller. This product works on banner material, vinyl, fabric, and other roll films.