Made from high strength SK2 high carbon steel, with Titanium fully coating for superior durability and long-lasting sharpness. 5X sharper and 15X durable than general blades. Effortless to cut through a variety of materials. Rust-resistant design for longevity and reliability. Each 10-piece blades packed in a hard plastic case, Extremely convenient, easy and safe for daily carrying, use and disposal. Total 30 Pack utility knife blades provide a long-lasting supply for all your cutting needs, Fit all standard and fixed utility knives, box cutters, roofing knives and so on, make it a must-have reserve for various toolbox. Perfect for cutting cardboard, leather, linoleum, rope, fabric, drywall, foam boards and so on, and perfect to recommend with coworkers, friends and families. Harita Utility Knife Blades, 30 Pack Standard Replacement Blades for Heavy Duty Utility Knives and Box Cutters, SK2 Razor Blades, Titanium Fully Plated, Never Rust, Extra Durable