Gillette Fusion5 ProGlide mens razor blade refills feature 5 precision blades for incredible comfort (vs. Mach3). With Gillettes thinnest and finest razor blades (first 4 blades, vs. Fusion5), ProGlide allows less tug & pull (vs. Fusion5). The Precision Trimmer on the back is great for hard-to-reach areas such as under the nose and sideburns. One razor blade refill equals up to one month of shaves. Fusion5 Proglide blade refills fit all Fusion5 & Fusion5 Power razors.