"Shave 5" cartridge replacement blades feature 5 ceramic coated blades and a lubricating strip in a cartridge that moves easily over contours and angles. It is designed to offer an exceptional shave for both men and women. These cartridge replacement blades are designed to fit Preserve "Shave 5" Razors only. (Will not fit Preserve original Triple Blade Razors). This pack includes four cartridge replacement blades. Never tested on animals.