United Cutlery Screaming Arrow Triple Set. This Throwing Knife Kit from United Cutlery is made with a 420 stainless steel material that is guaranteed to stay sharp for incredibly long periods of time. For a great way to throw like a pro choose the United Cutlery Triple Screaming Arrow Thrower Knife Set. Specifications for United Cutlery Screaming Arrow Throwing Knives: Blade Material: 420 Stainless Steel Sheath Material: Leather Package Contents: United Cutlery Screaming Arrow Triple Throwing Knife Set UC0080SET Leather Sheath United Cutlery UC0080SET: Screaming Arrow Triple Set