Unique paint formula resists spreading and dries quickly through oily surfaces to leave precise, permanent marks. Xylene-free paint reduces user health risks and eliminates California Proposition 65, EPA HAPS and SARA 313 concerns in the U.S.A.. Durable metal barrel and nib reduce breakage for longer marking life. Easy-to-grip clip-cap allows for convenient pocket storage. Marking range: -46°C to 66°C  (-50°F to 150°F).