Pack of 12 Gillette Mach3 blades. The Lubrastrip indicator fades to let you know when to replace the blade. Mach3 razor blades are among the world's most iconic and have been rated the world's No. 1 3-bladed razor. Each cartridge contains 3 of Gillette's renowned stronger-than-steel blades designed to stay sharper for longer and offer a classic smooth shave. With one Mach3 cartridge, you can comfortably shave up to 15 times.