Black Rayskin Wrapped Saya 黒鮫皮 Option:Imitation Rayskin crafted from gilded brass（黄銅鍍金） with

crafted from gilded brass（黄銅鍍金） with a nanako-ji（魚子地） surface texture

The tsuba (鍔) is a mokko-gata (木瓜形) iron guard with blackened patina (煮黒仕上げ) and plum blossom sukashi (梅花透かし)

Habaki (鎺): Hand-forged from brass with an aged

while a softly flowing notare hamon (湾れ刃文) emerges through traditional clay tempering (覆土焼入れ)

Black Rayskin Wrapped Saya 黒鮫皮 Option:Imitation Rayskin crafted from gilded brass（黄銅鍍金） withHandcrafted Black Rayskin Wrapped Saya with Natural Horn FittingsKoshirae Grade Finish This handcrafted saya is a Black RayskinWrapped Saya (), featuring a deep black finish that adds distinctive texture and visual depth, providing a refined yet powerful alternative to conventional lacquer only saya. The black tone conveys strength, restraint, and formality, while preserving the understated aesthetics of traditional craftsmanship. The koiguchi