These glassine envelopes are an economical way to preserve prints, negatives and transparencies from fingerprints. Flat single seam construction. Archival quality and is made of pH negative, non-plasticized glassine paper to provide long term storage. Archival material created and made in USA. Lineco is a leading and trusted brand for archival quality art, photography, and framing supplies Preserve Your Prints: Archival print sleeves are ideal for prints from fingerprints, scratching Material: The envelopes are made of pH negative, non-plasticized glassine paper Design: The glassine envelopes are translucent for easy visibility and has an open-ended design Pack of 100 Sheets, fits prints 4″ x 5″