After wrapping a scabbard with shark skin, it was lacquered in black, indigo or vermilion, and then finished using a grinding stone to make a decorative pattern, which is characteristic to samezaya (a sheath made of sharkskin).
鮫皮を巻いてその上に黒・藍・朱などの色漆をかけ、それをさらに砥石で研ぎ出して装飾文様を浮き出させる「鮫鞘」である。