Just For Men Moustache & Beard Color in Medium-Dark Brown (M-40) is a specialized facial hair coloring product designed to provide natural-looking coverage for gray facial hair. This easy-to-use formula targets and colors even the coarsest facial hair while being gentle on skin. The product comes in a convenient kit with all necessary application materials. The medium-dark brown shade (M-40) provides a natural-looking result that lasts through multiple washes. The formula is specifically designed for facial hair application and works in just 5 minutes. For best results, perform a patch test 48 hours before use and follow all included instructions carefully.