The Gillette Mach3 is a revolutionary new triple-blade shaving system for the closest shave ever in fewer strokes - with less irritation. Each cartridge has patented DLC comfort edges on the blades and the blue lubricating strip fades when time to replace. The open cartridge architecture is designed for easy rinsing.From skin and oral care to home appliances, Gillette products touch lives around the world every day Triple-blade shave means less irritation Patented DLC comfort edges Open cartridge architecture for easy rinsing Blue lubricating strip fades when time to replace 4 Gillette Mach3 refill cartridges