Precision-crafted with High Quality Imported Japanese SKS-7 Steel (Rockwell hardness 62-64), these blades ensure prolonged, uninterrupted cutting. They feature Razor Sharp, Double Honed Edges, capable of slicing through synthetic, organic, leather, vinyl, foam, and more. Universally fitting major branded handles, these blades measure 45mm, are made of Steel, and are designed for use as Replacement Rotary Cutter Blades. Each pack includes 2 Blades and a Plastic Case, product number #400SK-PK2.