The Gillette Labs Refill cartridges pack of 4 is a genuine product designed specifically for Gillette razors. Made with stainless steel blades, these cartridges feature 5 blades each to ensure a smooth and comfortable shave. Suitable for facial use, these black cartridges come in a pack of 8, providing a long-lasting supply for your shaving needs. Trust in the Gillette brand for quality and reliability when it comes to your daily grooming routine.