Elmer's Washable Non-Toxic X-TREME School Glue Stick is specially formulated to work on bigger, tougher projects. Use it for everything from craft items to science fairs and many other school projects. The extra strength formula works on a variety of surfaces. It also goes on smooth, dries clear and washes easily off of hands and out of clothes. Elmer's Washable Non-Toxic X-TREME School Glue Stick is safe, non-toxic, as well as acid free and photo safe.