StoreSMART - Magnetic-Back Rigid Protectors 10-Pack - 5" x 7" - Clear Plastic Sign Holders - Refrigerator or Locker Magnet - Top Loaders - HPP5X7M-10 Made of clear, high-impact 16 mil PVC vinyl with a 40 mil opening. Overall size: 5 7/16" x 7 1/4" Inside capacity: 5" x 7" Open on the short side. Has one strong 2" x 3" magnetic rectangle on the back.