ClearBags Crystal Clear Bags help you promote, protect, and preserve your paper crafts, photos, documents, artwork, collectibles, stationary, and crafts. Made from Biaxially Oriented Polypropylene (BOPP) for exceptional clarity with static-free, re-sealable adhesive strip closures. Durable 1.6 mil and are US Postal approved with additional postage required. 4"x 6" Stationery 25pc- Excellent protection from fingerprints so photos will always look great. Add a backing or pre cut mat to your image for a professional presentation. Archival quality provides the ultimate in photo storage protection. Measures approximately 4.94"x 6.56".