Kaeru=Frog is JNS pro knives series
Made in Sanjo, Niigata
They come with original Ho wood D shape handle with Buffalo horn
Steel: Blue 2 steel water quenched
Handle: Ho wood D shape with buffalo horn 
Approx.. measurements:
Handle Length- 160mm
Handle Width- 25mm
Hell to Tip Length- 275mm
Blade Height at Heel- 50mm
Width of Spine at Handle- 3mm
Width of Spine at Middle- 2,5mm
Width of Spine 1cm from the tip- 1mm
weight: 210g 
All knives JNS cary is handmade and made one by one, so they can vary in size and thickness. Unevenness in finish can occur.
 
             
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                            