The Gillette Labs Razor Blade Refills are a pack of 8 genuine stainless steel cartridges designed for use with Gillette razors. These refill cartridges are specifically compatible with Gillette razors and feature 5 blades each for a smooth and comfortable shave. The black cartridges are easy to install and provide a reliable and high-quality shave, making them an essential accessory for maintaining facial hair. Perfect for daily use, these Gillette Labs razor blade refills offer convenience and effectiveness in one package.