After the bamboo is cut and beat with this knife and Manila rope is cut 350 times, you can slice the paper. The bottom of this blade edge is 30 degrees, and it's continuously change to top of the blade.The top edge's angle is 24 degrees. The change in this angle is a result of ROCKSTEAD that pursues sharpness. This is a knife of preeminent sharpness. You can enjoy its strong cutting capabilities for a long time. KOU had a minor change. It is the improvement of the clip, the improvement of an internal structure, and the increase of embellishment.