Marks on metal, wood, plastic, glass, cardboard, dirt, etc.; Writes on any surface: rough or smooth; wet, oily or dry. Even marks under water; Marks are permanent; they wont chip, peel, fade or rub-off. They withstand heat and weathering under adverse conditions; If desired, marks can be removed from non-porous surfaces with standard industrial solvents; Available in 4 fast-drying, lead-free colors.