The Gillette Mach3 Razor Blade Cartridges come in a pack of 4 cartridges, with each razor blade made of stainless steel and measuring 2.25 inches in length. These black cartridges are compatible with Gillette Mach3 razors and are designed for use on various body areas including the chest, back, neck, face, and body. With 3 blades per cartridge, these replacement blades by Gillette are essential for maintaining a smooth and clean shave, making them a must-have for men looking to achieve optimal grooming results. 2 packs. 8 cartridges total.