The precision trimmer on the back is great for hard-to-reach areas and styling facial hair. The lubrication strip fades when you are no longer getting an optimal shave. One razor blade refill equals up to one month of shaves. Fusion5 men's razor blade refills fit all Fusion5 and Fusion5 Power razors. Gillette razors, formerly called Gillette Fusion. This pack includes 4 Fusion5 razor blades. Gillette razor blades with 5 anti-friction blades. Precision Trimmer on back. Lubrication strip that fades when you are no longer getting an optimal shave. 1 razor blade refill equals up to one month of shaves. Fits all Fusion5 and Fusion5 Power razors.