This is the most practicable sheath knife. Because, it is very compact size. Therefore, it is very useful for outdoor.This blade shape is a consecutive convex surface. Please confirm our HONZUKURI blade. ZDP189 is a powder stainless steel material developed for cutlery. It is a product of the nanotech. Sharpness did not decrease so much to the blade of ZDP189 after having cut hard Manila rope 780 times. However, it is an unsuitable knife to the beating cut. Please enjoy the beauty of the completed blade.