Authentic. Anti-theft. Up to 12 months of shaves (per pack). Lubrication strip. Stronger than steel blades. Microfin guard. Fits all Gillette Mach3 razors. The best of a man can get. www.Gillette.com. www.pg.com. how2recycle.info. Comments? 1-800-Gillette. Terracycle. Visit terracycle.com/Gillette to recycle used blades, razors, and packaging.