Fixed Knife Extrema Ratio T4000 S. The T4000 S continues the purest tanto Extrema Ratio collection for those who love Japanese profile blades but don’t want to give up the typical tactical accessories like handle and sheath. TECHNICAL SHEET Weight g.: 264.0 Weight oz.: 9.3 Blade length (mm): 174 Blade length (in): 6.9 Overall length (mm): 304 Overall length (in): 12.0 Blade Thickness (mm): 4.0 Blade Thickness (in): 0.16 Blade Material: BöHLER N690 STEEL (58HRC) Blade Finish: HEATING MIL-C-13924 Main Grid: FLAT Handle Material: FORPRENE