5 blades + 1 trimmer. 5 blade shaving surface technology - has 5 blades spaced closer together to help reduce pressure with less irritation and more comfort than Mach3. 1 precision trimmer blade - built into the back of the cartridge. Perfect for tricky places like sideburns, under the nose and around facial hair. All Fusion cartridges can be used with all Fusion razors.