Frost Sheath Formed Nylon Fits Up To 5in Folding Knife Black Nylon Sheath Black. This Knife Case from the expert product specialists at Frost is made with a black nylon sheath and includes easy to follow illustrated instructions that make it incredibly easy to use. For an amazing way to make sure you are using some of the best gear the industry has to offer choose the Frost Sheath Formed Nylon. Package Contents: Frost Sheath Formed Nylon Frost SHNF5SHEATH: Sheath Formed Nylon Fits Up To 5in Folding Knife Black Nylon Sheath Black