Avias Knife Supply 9 Inch 3 Piece Stainless Steel Throwing Knife Set With Nylon Sheath (Jack Ripper - Silver) 9 inch in overall length. Its material is stainless steel. This set includes 3 pieces of Stainless Steel throwing knives. These are available in other shape variations. Nylon Sheath with Velcro closure and belt loop is included.