- Start Carbon Fiber, Satin for the discerning consumer who expects the knife to always perform reliably while looking great. Fabrizio Silvestrelli's design exudes Italian style and solid construction. Advanced Back Lock mechanism.

This product is intended for use only by adults with knowledge and experience in handling sharp cutting tools. Improper use of the knife can result in serious injuries. The blade is extremely sharp and can easily cut through skin and tissue; therefore, extra caution should always be exercised while cutting, and hands should be kept away from the cutting edge. To prevent the knife from slipping, it is recommended to cut on a stable, non-slip surface and avoid excessive force, which may cause uncontrolled blade movement.
Leaving the knife on the edge of a table, countertop, or in easily accessible places—especially where children are present—poses a significant safety risk. The knife should always be properly secured after use, ideally by placing it on a stable surface or storing it in designated knife blocks, protective sheaths, or magnetic strips. The knife should never be used for tasks it is not designed for, such as opening cans or prying objects, as this can damage the tool and lead to dangerous accidents.
A dull blade increases the risk of injury, as it requires more force and is more likely to slip from the material being cut. Therefore, it is essential to sharpen the knife regularly to maintain optimal sharpness. Additionally, proper cleaning and drying of the knife are necessary to prevent corrosion and bacterial growth. Periodic inspection of the handle and blade is recommended to check for cracks, chips, or looseness. If any damage is detected, the knife should be repaired or replaced immediately.
When using the knife, focus solely on the task at hand—avoid talking on the phone, watching television, or other distractions while cutting. Ensure proper lighting in the workspace for better visibility and control. Please note that some countries or regions have laws restricting the ownership and carrying of knives. Before purchasing or using this knife, verify that its use is legal in your location according to applicable regulations.
Following these safety guidelines will help ensure safe and effective knife use, minimizing the risk of accidents and extending the lifespan of the tool.
Start Carbon Fiber, Satin for the discerning consumer who expects the knife to always perform reliably while looking great. Fabrizio Silvestrelli's design exudes Italian style and solid construction. Advanced Back Lock mechanism, carbon fiber liners, rounded spacers, extremely precise joints, flat mounting screws and comfortably curved edges.
Design by Fabrizio Silvestrelli fruit of a collaboration with the esteemed Italian knifemaker, president of Corporazione Italiana Coltellinai (CIC), the Italian knife guild. His designs are characterized by the rounded shapes of the liners, bolsters and handles. Designed by Fabrizio Silvestrelli, the Viper Start exudes Italian style and solid construction. Equipped with a newly developed Advanced Back Lock mechanism using two springs instead of one.
N690 - corrosion-resistant, high-carbon 1.07% (C), martensitic chromium steel 17.30% (Cr) with molybdenum 1.10% (Mo), vanadium 0.10% (V) and cobalt 1.50% (Co) for structural uniformity. Features exceptionally high corrosion resistance and long edge retention. One of the best tool steels in the world today. Achieves a hardness of 57-60 HRC. Manufactured by Böhler Edelstahl in Kapfenberg, Austria.
Blade - Spear Point type with clearly marked belly, finished in elegant Satin method. The small thickness of the blade combined with a high, flat grind that provides strength, excellent cutting edge geometry and extreme cutting performance. The bolsters are responsible for the smooth and smooth operation of the blade's opening mechanism, which can be opened with a double-sided peg (Thumb Stud) making it easy for both right and left-handed people to open the blade with one hand. Notched supports: a thumb ramp on the back of the blade (spine jimping) and (finger choil), an undercut for the index finger make it easier to control the knife.
Handle - made of Carbon Fiber (carbon fiber compressed under pressure with synthetic resin). Bolted to a steel frame, which means the practical indestructibility of such a design. The rounded shape of the facings and backspacer eliminates any sharp edges. The use of CNC machine tools in the production process of the covers guarantees the maintenance of high quality of the manufactured elements.
Technical data:
Product number: V5850FC
Product name: Start Carbon Fiber, Satin
Overall length: 235.0 mm / 9.25"
Blade length: 105.0 mm / 4.0"
Handle length: 133.0 mm / 5.25"
Blade thickness: 3.5 mm / 0.14"
Weight: 178.0 g / 6.28 oz
Blade material: N690
Blade hardness: 58-59 HRC
Blade grind: Flat
Blade finish: Satin
Handle material: Carbon Fiber
Handle finish color: Black
Backspacer material: Stainless Steel
Backspacer Color: Silver
Clip: Right, Tip-up
Clip material: Stainless Steel
Pivot mechanism: Washers (washers)
Locking mechanism: Advanced lock-back, two wire springs
Opening method: Manual, dual thumb studs
Additional accessories: None
Designer: Fabrizio Silvestrelli
Brand: Viper
Manufacturer: Tecnocut SNC, Italy
Country of Origin: Italy
Development: a Sharg® company