Gillette Fusion5 Men's Shaver Replacement Cartridges feature 5 antifriction blades for a shave you can barely feel. The Precision Trimmer on the back is excellent for hard-to-reach places like the lip under the nose and sideburns. The lubricating strip turns white when you're no longer getting an optimal shave. A spare shaver cartridge is equivalent to up to a month of shaving. Fusion5 Men's Shaver Replacement Cartridges can be used with all Fusion5 and Fusion5 Power shavers. Gillette shavers, formerly called Fusion.