Qualità d’Autore
Made in Italy


M390 MICROCLEAN is a third generation stainless steel produced with powder metallurgy having extreme wear resistance, high corrosion resistance, high toughness and dimensional stability, excellent flexibility and resistance to mechanical shocks. The ideal hardness lies at HRC 60/61, recommended for high performance blades.

Produced by Böhler Uddeholm it represents a great compromise between cutting and oxidation-resistance attributes. The ideal hardness lies at 58-60 HRC and this entails a good compromise between great cutting attributes, resistance to stress and ease of re-sharpening. This is perfect for the folding knife’s daily use but is also a great choice for hunting as they are often in contact with blood and other corrosive substances.

Although often defined as “semi-stainless” in the jargon used by knife enthusiastics, the high chrome content of 12.00% provides the D2 with a good resistance to oxidation under a normal use. Compared to stainless steels the D2 distinguishes itself by its superior edge holding and for its toughness, which make it suitable for the construction of solid work tools. When it is used for folding knives it is possible to temper the steel a bit harder to enhance its cutting attributes without any consequence on its fragility.

W.Nr.1.4116 / 440A
Not only extremely resistant to oxidation it has also good cutting qualities which make this steel perfect for food knives. The sharp edge that can be obtained is not only very good but also lasts longer than other steels commonly used in the kitchen industry.

The Damascus steel is made from several types of steel and iron slices fused together. The billet formed is then folded until the desired number of layers is obtained. This number doubles at every folding process. The blades finally get the famous design by undergoing an acid burden that reacts differently based on the steel.
The Damascus steel can either be stainless or have a high-carbon content. The different patterns emerge based upon the number of times and the way the billet is folded.


The acronym stands for Physical Vapour Deposition. This consists in a superficial condensation treatment obtained by vaporising the metals that will form the layer of the coating. The metals are then deposited on the surfaces to be treated.
The final result is a very long-lasting, protective layer that has superior adhesion attributes compared to varnishes or polymer thin films.

On the bigger blades we apply a special treatment of superficial modification that allows us to get a black and opaque coloration (which meets MIL-DTL-13924 standards) enhancing at the same time the resistance to corrosion.
The burnishing is achieved by immerging the steel in suitable oxidant solutions previously heated to its specific temperature. The surface obtained is essentially made of extremely hard oxides that are usually 0.1 micron thick.

Our blades’ satin finish is manually achieved by highly skilled craftsmen, using appropriate abrasive wheels for satin finishing. Therefore the precious craftsmanship that is Viper’s pride yields this superlative final result.

The bead blasting is the process of cryogenisating the surface by applying fine glass beads at a high pressure. This allows augmenting the wear resistance of the surface itself and to get anti-reflective surfaces. To obtain a satisfactory outcome it is mandatory to carefully assess and choose the abrasive material.

The stone washing process consists in vibrating the metal inside of huge containers full of specific abrasive stones and grits. The final result is an opaque surface, able to gloss the wear marks over.
The stone washed blade tends to keep the rust away and is thus suitable for steels which are not utterly resistant to oxidation.