The blades that ship with Rapala® Electric Fillet Knives are designed to last the life of the knife. However, on occasion a blade may get lost or damaged from misuse, so Rapala offers replacement blades. Anglers who fillet bigger species will want to upgrade to the 9" model to handle large trout & salmon. Replacement blades are available in three sizes that work with all models of Rapala Electric Fillet Knives.