4 X Blades to fit ProGlide Beard Trimmer & Power Razor, Fusion ProGlide Power Razor with FlexBall™ Technology, FusionPro Glide Manual Razor with FlexBall™ Technology, Fusion ProGlide Silvertouch Power Razor with FlexBall Technology, Fusion ProGlide Silvertouch Manual Razor with FlexBall Technology, Fusion Power Razor, Fusion Manual RazornThe Technology that Has 5 blades spaced closer together to help reduce pressure - with unsurpassed comfort. n1 Precision Trimmer Blade built into the back of the cartridge. Perfect for tricky places like sideburns, under the nose, and around facial hair.