This indigo blue guinomi sake cup, crafted by Seigado, boasts a rounded shape that fits comfortably in the hand and offers a smooth rim. 

This hammered copper sake cup radiates a gem-like sparkle, ideally designed for evenings enjoying sake. 

A sheet of copper is carefully crafted using the traditional hammering technique known as tsuiki to shape this sake cup into a seamless piece. Tsuiki is a metal crafting technique that involves hammering and embossing various metal plates, such as gold, silver, copper, and tin. The hammering marks are left as beautiful patterns on the finished products.

Copper's high thermal conductivity enhances the chill of cold sake, while the tin coating inside softens its flavor. The copper also deepens in color with use, adding enjoyment over time.