Gillette Fusion Blades 4's 5 precision blades, helping reduce pressure per blade for a comfortable shave (vs Mach3). Precision Trimmer on back, great for edging tough areas (nose and sideburns). 1 razor blade refill equals up to one month of shaves. Fits with any Fusion blade refills.Gillette Fusion Razor Blade Refills have 5 precision blades spaced closer together (vs Mach3) for less feel of irritation and incredible comfort. Each blade refill also has a Precision Trimmer on the back, great for edging tough areas such as under the nose and sideburns. One razor blade refill equals up to one month of shaves. These Fusion blade refills can be used with any Fusion razor handle.