Product Features: Auto tire pen is produced as a pen that writes on all tire sidewalls. It is a rubber writing pen made of quality real paint that can be used on rubber and plastic. It is white in colour. Application: There is a shaking mechanism inside the metal case. Shake the pen well to wet the wick. Press the wick tip for a while and wait for the paint to flow. Go over it until it covers the text. It has a long lasting effect. Rubbing the tire sidewall on areas such as pavement may cause premature deformation of the paint.