【Durable and Reliable】Made from Heavy Duty Premium SK2 Black High Carbon steel with a special honed edge design for consistent extended cutting life. 【Extra Sharp】Special Double Blades Angle Design for Sharp and Smooth Cut. 【Convenient Storage】Comes with storage containers 10 blades for each plastic box for safe storage and disposal, making it easy to keep your workspace organized. 【Rust-Resistant】The blades are coated with a light coat of anti-rust oil to prevent rust and stay sharp. 【Versatile Use】Ideal for cutting cardboard, leather, linoleum, rope, soft metal, and more, making it a great addition to any DIY or professional project. Box Cutter Blades Utility Knife Blades SK2 High Carbon Steel Utility Knife Box Cutter Blades Knife Replacement Heavy-Duty Utility Razor Replacement Blades Utility Knife Refill Blades Pack of 30