Gillette Fusion Power Razor Heads x4. Gillette Fusion Power Replacement Razor Heads To use with the Gillette Fusion Power Phenom Razor Pack contains 4 Spare cartridges, each lasting up to 3 months!Each Blade has 5 closely grouped blades to reduce surface pressure and 1 precision trimmer blade on the reverse side for tricky areas (such as sideburns and under the nose). ....(continued here)