Katana – Blue Tempered High Carbon Steel Blade with Water Ripple Polish | Shinkai Koi Edition

【Overview】

This katana features a deep blue tempered blade paired with koi-themed mountings, inspired by the calm depth of the ocean. It blends refined aquatic aesthetics with reliable cutting performance, making it suitable for both display and practical use.

【Blade & Craftsmanship】

The blade is hand-forged from high carbon steel and finished with a blue tempering process, creating a rich, ocean-like hue. A full-length bo-hi (fuller) improves balance and swing efficiency.

The cutting edge is hand-polished using a Water Ripple polish, producing flowing wave-like patterns that enhance both visual depth and craftsmanship.

【Design & Mountings】

An exclusive silver koi–carved tsuba symbolizes perseverance and strength. The aquatic motif is elegant yet restrained, preserving a dignified samurai character.

【Handle & Saya】

The saya is crafted from dense Ipe hardwood and finished with lacquer for durability and luster. A raised koi carving adds dimensional detail and elevates the sword’s presence as a collectible display piece.

【Performance】

The blade delivers clean, consistent sharpness, capable of slicing plastic bottles and similar cutting targets with ease. High carbon steel ensures dependable edge performance and structural stability.

【Specifications】

Overall length: 103 cm (40.6 in)

Blade length: 72 cm (28.3 in)

Handle length: 26 cm (10.2 in)

Blade width: 3.2 cm (1.26 in)

Blade thickness: 0.7 cm (0.28 in)

Total weight: 1.3 kg (2.87 lb)

Net weight: 1.0 kg (2.20 lb)

【Usage & Gift】

Ideal for collectors, martial arts practice, refined interior display, fitness cutting, and thoughtful gift-giving. A visually distinctive katana that pairs calm elegance with functional strength.