"SLING BLADE"   **THE GREY GHOST FOLDER**, 4 1/2" Closed, 7 1/2" Open, Weight 4.5oz. Model # SBL-34W/B These are made in a Fixed Blade and a Folder. This new style of knife took a full year to develop, its unique design and trail and error with different materials is why but Frost finally did come up with the very best materials to make the ideal knife for all / any outdoors activity a perfect (EDC) knife. The Blade is made of D2 Steel and the craftsmen made a 18-Ball-Bearing Pivot System for a super Smooth, and fast blade deployment, Assisted Opening with a system like this you will never need to worry about the dependability of the D2 Blade opening fast if or when you ever have the need.