Glue sticks contain glue made from more than 88 percent natural ingredients. Naturals School Glue Sticks are made from plants, a rapidly renewable resource, and are just as safe and nontoxic as Elmer's School Glue Sticks. The glue stick containers are made with post-industrial recycled plastic. Label is made from FSC certified paper and printed with soy inks. Acid-free glue sticks apply and dry clear. Any excess glue can be cleaned with soap and water and can be washed out of clothing.