Compatible with the rest of the Gillette Mach3 range, this 16-pack of spare refill razor blade cartridges offers classic, comfortable shaves. With skin-stretching microfins built into the design of each of these carefully engineered blade heads, these Mach3 blades are sharp and easy to keep clean thanks to their open architecture that allows water to flow through them freely. With three blades in each refill, you can capture more hair with every stroke compared to single-bladed designs. Gillette Mach3, 16 pc, Replacement blades for Men. Not getting the same precision results with your shaver as before? It’s time to change the blade. The Gillette Mach3 replacement blades ensure the same smooth shave as with a new shaver. Characteristics: ensures the smoothest of shaves, does not irritate the skin. How to use: Follow the instructions included.