- YoJumbo G-10 Black, Black Blade design by M. Janich personal defense expert and trainer who pioneered the use of the Wharncliffe blade in folders. Sophisticated ergonomics complement the natural curves of the hand for maximum surface contact

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.
YoJumbo G-10 Black, Black Blade Plain design by Michael D. Janich a renowned Personal Defense Trainer and expert, pioneering the use of the Wharncliffe blade in tactical folders. The refined ergonomics complement the natural curves of the hand for maximum surface contact and superior control. It also encourages forward thumb grip and makes the blade a natural extension of the hand.
CPM S30V - corrosion-resistant, high-strength American powder steel with carbon, chromium and vanadium with a hardness of 58-59 HRC. This unique steel is designed for the production of high-quality blades and knives. Manufactured at Crucible Inc. mills.
Compression-Lock - (similar to Liner-Lock) Spyderco's patented blade locking mechanism. Extremely durable, provides extreme strength and ease of use. Located on the back of the handle, protects the knife from unintentional closing. When releasing the lock your fingers are not in the way of the folding head.
Blade - Wharncliffe profile, 3.7 mm thick, covered with black DLC coating (Diamond-Like Carbon). Plain blade has been ground with a concave grind (Hollow Grind). The straight concave cutting edge provides exceptional cutting performance, transferring power to the blade tip for improved scoring strength. The enlarged 14mm round SpyderHole cutout (Spyderco patent) allows easy opening of the blade with a glove as well as wet, sweaty hands.
Handle - stainless steel liners and lightweight grips made of G-10, a durable, heat- and cold-resistant, chemical-resistant plastic. The whole is bolted with torx screws for easy unfolding / folding of the folder. Metal clip with the possibility of fixing in four planes (up / down, right / left) 4-way clip positions.
Technical specifications:
Product Number: C253GPBBK
Name: YoJumbo G-10 Black, Black Blade
Steel Type: CPM S30V
Blade length: 101.0 mm / 3.98"
Blade thickness: 3.7 mm / 0.145"
Overall length: 236.0 mm / 9.29"
Folded length: 136.0 mm / 5.37"
Weight: 150.0 g / 5.3 oz
Cutting edge type: Plain
Grind Type: Hollow Grind
Lock type: Compression-Lock
Handle Type: G10, Black
Clip Type: 4-position ambidextrous, Tip-Up/Down
Country of Origin: U.S.A.
Manufacturer: Spyderco, U.S.A.
Prepared by: Sharg® company