Treet Carbon Steel Double Edge Razor Blade is a double razor blade made of black High-Carbon steel from Sweden. Called "Black Beauty" in wet shaving communities. Fits all classic safety razors and shavettes (split the blade in half). Made in Pakistan. Sharpness: Mild Units 5 bladesCan be used for all classic safety razors. For shavettes - leave the blade in the sheath and break it in half. Treet Carbon Steel Double Edge Razor Blades 5-Pack 5 stk