Shaver Replacement Foil Head Compatible with Remington TITANIUM-X Flex & Pivot Foil and Cutter Head for Shaver F4900,F5800,F7800 HIGHER QUALITY:Replacement Shaving Head & Cutter Blades with Hypo-Allergenic Foil Head with Bump Prevent Technology, Easy to Install: You can replace the shaving heads in a few minutes.place a tiny drop of baby oil on each heads and allow shaver to run for 10 seconds after installation ,to ensure your shaver run properly and smoothly. Shaver Replacement Foil Head Compatible with Remington TITANIUM-X Flex & Pivot Foil and Cutter Head for Shaver F4900,F5800,F7800