CERAMIC ZIRCONIA RAZOR BLADES: In this package you'll receive 10 replacement snap off ceramic razor blades; the razor blades are non dulling, rust resistant, nonmagnetic, nonmetallic and non porous, and come in a handy plastic storage case to keep unused blades safe and secure LONG LASTING BOX CUTTER BLADES: Durable and strong, ceramic zirconia construction allows for long periods of incredible sharpness, superior edge retention and will easily slice through foam, paper, fabric, rubber and more with speed, accuracy and precision SHARPER THAN STEEL: ToolTreaux's ceramic razor blades will outperform standard steel blades whether they're being used in a warehouse setting or at home for craft and hobby; the razor blades will afford you a longer, more reliable and uninterrupted work flow across many different projects CRAFT KNIFE COMPATIBILITY: These ceramic replacement razor blades are only compatible with craft knives or pen cutter tools that can house a 9mm blade; not compatible with a standard 18mm box cutter or utility knife SPECIFICATIONS: Case Dimensions: 4 x 0.5 x 0.5 inches; 10 Pack Weight: 0.5lbs; Color: White; Material: Ceramic Zirconia; Blade Weight: 0.01lbs; Blade Dimensions: 4.25 x 0.25 x 0.06 inches