Patented design provides less drag on blades, less user fatigue and improved fillet yield. Flexible, hollow ground, double-scalloped blades provide reciprocating blade action for greater precision and maneuverability. New shark blade technology provides more efficient operation of the fillet knife, reducing heat and strain for improved life of the tool. Shark blades operate in all American Angler electric and cordless models. Manufacturer provided limited one year warranty.