Pop Up Glue Dots are a dry adhesive used for creating three-dimensional effects in art projects, science dioramas and more. One Pop Up is approximately 1/8" thick; stack two and you've got a 1/4" thickness; three gives you a 3/8" thickness, etc. Glue dots are double-sided adhesive dots that bond instantly to paper, plastic, foam, wood, fabric and more. They re completely mess-free and there s no waiting for the glue to dry. Easy to use, they re suitable for adults and children. Glue Dots are safe, non-toxic, acid-free, lignin-free and photo-safe. Contains 75 dots per roll.