This is a Package of Five #10 Sharp Curved Precision Hobby Blades by Excel. Made from precision, high-grade steel. Double honed. Interchangeable. Used for cutting, trimming and carving. Razor sharp, curved edge! Blades come in a clear, plastic safety tube. Five Curved Hobby Knife Blades (#10) Aluminum Handle Safety Goggles Adult Supervision kr9/26/01 ir/kh &