Product: No. 21 Disposable Scalpel with Plastic Handle and Carbon Steel Blade, 10 Per Box/Pack. Sterile: These scalpels are sterilized by gamma radiation to eliminate the risk of infection. Sharp blades: The blades are made from carbon steel and are very sharp to ensure a clean cut. Plastic handle: The handle is made from plastic and is disposable. Plastic handle: The handle is made from plastic and is disposable. It has a textured grip to prevent slipping during use.