Merkur Platinum Razor Blades will fit in most double edge safety razors as shown in the picture. They are sharp on both side. These blades are made of stainless steel and they have a special platinum coating for durability. Merkur Super Platinum Double Edge Razor Blades provide a very smooth shaving result, but they are relatively forgiving, so also men that just started using safety razors can use them. These razor blades work best for men that do not have sensitive skin. This box contains 10 cartons with 10 razor blades each, so 100 in total.