Gillette Mach 3 Nano Ultra Fine Blades Pack of 4 The MACH3 Nano blades are thinner than a surgeons scalpel & give you a close shave in a single stroke. A trusted choice, the MACH3 continues to give men around the world an ideal start to their day. One pack will last 12 weeks. Features three blades for a close, comfortable shave Specially positioned blades progress gradually closer to your beard, resulting in fewer strokes Each blade has a patented DLC Comfort Edge to help minimize irritation Advanced indicator lubricating strip features a gradually fading blue stripe to alert you that its time to change blades All Mach 3 cartridges fit all Mach 3 razor handles