Forged from a single piece of steel, ZWILLING Pro series knives feature a sharp, flexible, and corrosion resistant FRIODUR blade that's been ice-hardened to 57° on the Rockwell Hardness Scale. The innovative curved bolster design on the ZWILLING Pro 10" Filleting Knife supports the professional pinch grip with the thumb and first finger on the blade giving you a safer, more comfortable, and controlled hold.