These wax crayons are manufactured by Germany’s oldest chalk and marking products factory, founded by Frantz Anton Moertel. The Company is now in its fifth generational of the same family. These 12 assorted wax marking crayons specially developed to write on a large range of materials including glass, porcelain, rubber, leather, paper, wood, metal and more. A box comes with two each of navy, green, black, red, yellow, and white crayons.