F.Dick 5" ErgoGrip Boning Knife, Curved Blade Flexible Blue, 8 2981 13

13cm = 5"
Ergogrip Blue Handle 
Narrow curved
8 2981 13
Flexible

The F Dick company has long manufactured professional knives, tools, and accessories for German and European butchers.
The Ergogrip knives offer large selection of specialized designs and sizes for specific butchering tasks. No compromise has been made when it comes to function and safety. Ergogrip cutlery features include:

Polished, durable stainless steel blade with laser-tested cutting edge
Seamless connection of blade and handle
Extra-wide thumb rest for control, comfort, and safety
Well-defined finger guard for safety
Non-slip plastic handle, no abrasion, ergonomic design
NSF listing for commercial use
Made in Germany