SOG Knives & Tools Pentagon FX, 3.41 Fixed Blade Knife, Spear Point Straight Edge, G10 Handle, CPM S35VN Steel, Black Titanium Nitride Finish, Black, Includes Nylon Sheath SOG-17-61-03-57 Designed as an evolutionary step in concealed fixed blade knives" Pentagon FX Covert is ideal for discreet carry. It features a double-edge CYRO S35VN full-tang steel blade" removable G10 handles and a minimalist GRN sheath compatible with SOG's next-generation Universal Mounting System. A lot of innovation is in this small package. It's modest in size" but big in capability.