General purpose crayon stick marker is made for a variety of temporary industrial applications where the mark needs to be removed. Writes on most dry, smooth or rough surfaces. Suitable for marking on glass, PVC, tin, iron, wood, concrete, aluminum, etc. The mark is easily removed from non-porous surfaces with water and a cloth. Working temperature range: 14°F to 122°F (-10°C to 50°C) Available colors: Red, Yellow, Black and White. 15mm diameter x 125mm length (5/8" diameter x 5" length). Will fit in most generic lumber crayon holders for frequent use.