AdTech's Permanent Micro Dot Glue Runner Refill is a replacement cassette for the complete unit and is both acid-free and safe to use on photos. The permanent adhesive bonds instantly to paper, ribbon, foam, plastic, wood, and many other materials, making it ideal for scrapbooking, photo albums, gift wrapping and a hot of crafting projects.Details:8.75 yd. each2 refillsAcid-freeNontoxicPhoto-safe