The TOPAZ PLATINUM blade is compatible with all standard double edge safety razors. Under typical use, you can get a week's worth of shaves (5 - 7) from a single blade. Platinum for sharp edges and close shaves. High Quality Stainless Steel PLATINUM COATED Blades. Treated with Platinum for smooth shaves and longer life. Extremely Sharp double edge razor blades. Packaging: 10 Tucks of 5 blades