No. 2 marking wax material makes permanent marks on most surfaces</br>Large size is long-lasting and easy to find</br>Certified AP nontoxic material allows safe use</br>Perfect for use on cardboard?? paper?? wood?? aluminum and more</br>Classpacks meet the needs of teachers for distribution</br>Perfect for Classroom and Group Activities</br>Sturdy storage container with corrugated cardboard dividers</br>Portability easy to distribute</br>Art and Classroom Educators seek variety in classpack sizes</br></br>Product Description</br></br>No. 2 marking wax crayons make permanent marks on most surfaces?? including cardboard?? paper?? wood?? aluminum and more. Typically used for industrial markings?? Staonal Crayons offer a large size so they are long-lasting and easy to find. Crayons are certified AP nontoxic.</br><br/>http://www.amazon.com/gp/product/B003QY2VR2