The BCW 45rpm Outer Sleeves are an acid free, archival quality product made of 2mil crystal-clear polypropylene. They come in packs of 100 sleeves. These outer sleeves will help protect the jackets of your collectible 7-inch albums. Use with BCW Record Album Topload Holders for an extra layer of protection. Dimensions are 7 3/8" x 7 5/8".