Otoya is a term used to describe the counterclockwise spin of Japanese arrows (while "haya" stands for "clockwise"). The spin depends on what part of bird feather was used to fletch the arrow.

The netsuke is carved from mammoth tusk and stained with dyes of natural origin.

The eyes are inlayed with red coral and jet stone. The grain of rice is inlayed with mother-of-pearl. The insert made of fossil buffalo bone, aged more than 50000 years, bears the carver´s signature.