Gillette Mach 3 Turbo replacement cartridges feature improved three-blade technology for a smooth shave, even when shaving against the grain. Their stronger-than-steel blades stay perfectly sharp for up to 15 shaves. For an even, irritation-free shave, each cartridge is equipped with protective SkinGuard microfins that stretch the skin and lift the hairs. For easier blade glide, Mach 3 Turbo replacement blades have a lubricating strip that activates on contact with water.