Rapala Fish’n Fillet Knives. The series includes four blade sizes for every cleaning chore. Features include progressively tapered blades of Scandinavian stainless steel that take and hold an ultra-sharp edge. Functional handle of handsome birch and a fine tooled leather Laplander sheath. Rapala Soft Grip Fillet Knives. The world’s most popular fillet knife just got better! Rapala has combined the famous Rapala flexible blade with a no-slip, soft grip handle for filleting comfort. Comes complete with fine-tooled leather Laplander sheath which keeps this indispensible knife ready at your side.