Thick, pigmented leads blend easily on paper, vellum, wood or plastic film Comprised of a clear, clean formula that allows for heavy layering. Best described as a color pencil without the color, the colorless blender is a new pencil created to blend and soften hard edges of color pencil artwork. Colors remain bright and brilliant. Conforms to ASTM D-4236. Certified AP nontoxic. Prismacolor Art & Drafting Supplies part of a large selection of office supplies. Prismacolor(R) Professional Thick Lead Art Pencil, Metallic Silver, Set Of 12 is one of many Crayons available through Office Depot. Made by Prismacolor.