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The Extrema Ratio Mamba is a remarkable fixed blade. Both the knife and the sheath are designed to be light weight. A much desired feature when minimum weight is needed. A lever on the sheath allows you to release the Mamba immediately for instant action. Plus the minimal, slender sheath allows you to slip it easily into a MOLLE loop. Well designed with the intent to create a distinctive light weight knife and sheath that complement each other.


The Mamba blade shows a strong Japanese influence in its shape. You also see this influence in the blade's half tanto point. To further decrease the weight, there is a fuller on each side.


The Mamba has a handle shape that definitely identifies it as being from Extrema Ratio. It is streamlined to reduce weight but still retains the classic Extrema Ratio handle profile.


The slender Mamba sheath is made of Aspis nylon. Especially designed to be light weight. Once a lever on the side is activated, the Mamba is swiftly and effortlessly removed. The sheath is designed to be easily inserted into MOLLE loops. No belt loop.

Total Length of Knife: mm 236.98 (9.33 inches)

Blade Length: mm 115.82 (4.56 inches)

Handle Length: mm 117.60 (4.63 inches)

Total Length of Knife and Sheath: mm 238.25 (9.38 inches)

Weight of Knife: g 82.21 (2.90 ounces)

Weight of Knife and Sheath: g 116.23 (4.10 ounces)

Blade Thickness: mm 4.00 (.16 inches)

Blade Width (Widest Section): mm 21.00 (.53 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Grinding: Flat grind

Serrations on Blade: No

Handle: Forprene**

Sheath: MOLLE compatible


* The blade is made with N690 cobalt stainless steel; a high performance steel with excellent cutting and sharpening characteristics. This steel is also used in the butchering industry and to make surgical instruments.

** The Forprene handle is resistant to extreme temperatures and moisture. It can be disassembled for easier cleaning.

Availability: Usually ships in 2-3 business days

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