When working with metals that can't risk corrosion caused by halogens found in ink, these trace element certified Sanford markers are the best choice for permanent markers. They leave marks on most surfaces and feature a cap that protects the fine tip and ink. Easily creates permanent marks on most surfaces. Trace element certified ink to minimize corrosion. Cleared use in the nuclear energy, aerospace, electronics, aeronautic and ship building industries that work with sensitive materials. Fine-tip marker offers precision. Features a cap and pocket clip. This black Sanford fine-point marker writes with precision.