Gillette Fusion Men's Razor Blade Refills have 5 precision blades spaced closer together (vs Mach 3) for less feel of irritation & incredible comfort Each blade refill also has a Precision Trimmer on the back, great for edging tough areas such as under the nose & sideburns. One razor blade refill equals up to one month of shaves. These Fusion blade refills can be used with any Fusion razor handle.