High-Purity markers are your answer for marking on stainless steel or any surface where degradation, contamination or other adverse effects are a concern. Low-chloride paint formula contains trace amounts of halogens and low-melting metals. The precise formulation meets or exceeds the specifications for GE Nuclear Energy, GE Aircraft Engines and the US Energy Research and Development Administration (nuclear grade). Valve-action mechanism allows the marker tip to be re-inked, even when the cap is left off. Lightweight design for fine, distinctive marking. Features a handy clip cap.