acid and lignin free clear envelope / bag / sleeve flap seal 10 7/16 x 10 1/4 + flap, ( 265x260 mm ) Cellophane Archival Quality Acid Free Lignin Free 25 - Resealable Envelopes 10 X 10 10 7/16 x 10 1/4 + flap, ( 265x260 mm ) PLEASE ALLOW FOR THICKNESS OF YOUR ITEM Bag sizes indicates the opening side as the first dimension PLEASE ALLOW SPACE FOR THICKNESS 1.6 MIL THICKNESS 40 MICRON PROTECT YOUR COLLECTIBLE ART , POSTER , DOCUMENT BOOK , MAGAZINE OR NEWSPAPERS ACID FREE = QUALITY STORAGE Crystal Clear Flap Seal Bags have the following features: ? Crystal Clear Optical Clarity ? High quality material will not easily rip, tear, wrinkle, or fog ? Acid and Lignin Free ? Archival Safe ? 1.6 mil thickness ? Adhesive on the flap allows you to customize the fit ? 10% Recycled Content ? 1/16? size tolerance ? Bag sizes indicates the opening side as the first dimension Protect and show off your finest prints and photography. 100% blemish-free polypropylene. Acid-free, archival safe. FDA compliant. MATERIAL: * BOPP (Bi-axially Oriented Polypropylene) FEATURES: * Acid free and archival safe. Country of Origin: USA FDA Compliant So why does all this matter? Simply put, acid and lignin cause paper to deteriorate. A good example of this is newspaper. You will notice that after only a couple of days, newspaper begins to turn yellow and brittle. The same will happen to your scrapbook and photographs over time if the proper materials are not used. These materials do not only include paper? adhesives, pens, markers, stickers, and anything else that comes into contact with your photographs must be acid and lignin free. CELLOPHANE ARCHIVAL ENVELOPES FLAP WITH SEALING TAPE ON FLAP all returns are subject to a 20% return / restock / handling charge , any return will also forfeit any multiple item discount for other item purchased at the same time when applicable envelope , bag , sleeve , flap seal , acid free , lignin free crystal clear 75 sizes in stock ready to ship , over 200 sizes available Features Benefits: Crystal Clear Flap Seal Envelopes have the following features: Crystal Clear Optical Clarity High quality material will not easily rip, tear, wrinkle, or fog Resealable adhesive strip on the flap of the bags (allows you to customize the fit) with the exception to the Protective Seal where the seal is on the body of the Envelope which leave little for adjustment Fast insertion and sealing Acid and lignin free Archival safe 1.6 Mil / 40 micron thick USPS approved Made with 10% recycled content Acid Free , Lignin Free , So why does all this matter? Simply put, acid and lignin cause paper to deteriorate. A good example of this is newspaper. You will notice that after only a couple of days, newspaper begins to turn yellow and brittle. The same will happen to your scrapbook and photographs over time if the proper materials are not used. These materials do not only include paper? adhesives, pens, markers, stickers, and anything else that comes into contact with your photographs must be acid and lignin free. AVAILABLE IN SIZES UP TO 60 " X 40 " 1.6mil (40 micron) thinkness archival quality. PLEASE ALLOW SPACE FOR THICKNESS Buyers with - 0 - feedback and less than 1 year will not be eligible to purchase and may be refunded