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