Phano china markers provide bold marks on glass, plastic, film, paper, metal, rubber, tile and more. Marks will wipe clean from non-porous surfaces. Each marker is paper wrapped with tear string for easy sharpening. Details:Available in multiple colors2 packs (12 markers per pack, 24 markers total)Marks will wipe clean from non-porous surfacesRemain readable to 1700 degrees Fahrenheit