Extrema Ratio Fulcrum C Fixed Blade Knife 4.25in Serrated Tanto Black Forprene Handle EX150FCT. Specifications for Extrema Ratio Fulcrum C 4.25in Fixed Blade Knife: Manufacturer: Extrema Ratio Blade Length: 4.25 in Overall Length: 8.38 in Blade Material: N690 Serrated: Serrated Handle Material: Forprene Sheath Material: ABS Package Contents: Extrema Ratio Fulcrum C 4.25in Fixed Blade Knife Extrema Ratio EX150FCT: Fulcrum C Fixed Blade Knife 4.25in Serrated Tanto Black Forprene Handle