Avery 76001 Secure Side-Load Sheet Protectors, Heavy Gauge, Letter, Diamond Clear (Pack of 25) The opening faces the rings so your important documents stay secure. The durable material is designed to withstand frequent use in a three-ring binder, is archival safe, acid-free and won't lift print off your papers. With everything in place, your papers are in good shape for the long haul. Protects 8 1/2" x 11" insert sheets.