Ultimate Arms Gear 4 Pack of Stealth Black Light Weight Polyresin Non-Metallic Self Defense Knife Dual Edge Dagger Straight Edge Blade and Serrated Cutter Side with Rubberized Grip Textured Handle 4 Pack of Self Defense Knives. Overall Length: 6.25" Blade Length: 2.75" Blade Material: Grivory ( Non-Metallic ). Knife Blade & Handle Color: Stealth Black Our Knives Are Light Enough to be Tied, Tucked, or Taped Just about Anywhere on Ones Person.