Sakura Industrial Permanent Crayon Marker, 5/8" Diameter x 5" Length, 14 to 122 Degrees F, White (Box of 10) General purpose crayon stick marker is made for a variety of industrial applications It writes on most dry or wet surfaces (except on wet glass) Waterproof and highly fade-resistant on most non-porous surfaces and is easily applied on smooth and rough surfaces Marking surfaces include: PVC, tin, iron, wood, concrete, aluminum and glass Removable from most non-porous surfaces only through friction caused by hard rubbing