Acid Free, Lignin Free, Buffered and Archival Quality these clear envelopes are just the thing to protect your precious creations from damage. Now there will not be as much fear when people are handling your artwork as they will be protected from the dirt, oils and acids that the body produces. Youll never know what you did without them. Great for protecting you Artists trading cards. 2 5/8 x 3 3/4 inch. Clear. 25 pc.