Disposable Stainless Steel Surgical Blades, Sklar, #20, Sklar's Disposable, Sterile, Stainless Steel Surgical Blade #20 is a larger version on the #10 Scalpel Blade. It has a curved cutting edge and a flat, unsharpened back edge. The #20 Scalpel Blade is typically not used in surgery, but may be if a long incision or digit amputation is necessary. These disposable blades are available in bulk quantities of 100 per box.