Variation Name Correction
Until July 2025, there was an error in the variation names listed on the product page.
・Usuzumi → Shiraaiyu
・Shiraaiyu → Usuzumi
We sincerely apologize for any confusion this may have caused. Please rest assured that all of the orders placed before this update are fulfilled based on the product shown in the photo, so you will receive the item as it appeared when you placed your order.

About the Texture of "Usuzumi"
The texture (glossiness and feel) of the product sold as “Usuzumi” may differ slightly from the product photo. These variations may occur due to differences in the firing process. Please understand this in advance, and refer to the product photos for more details.

Frustum Series

The Frustum series is a line of tableware refined in design to suit modern lifestyles, created to help us rediscover the charm of tea.

The defining feature of the cup’s body is a distinct edge around its middle—this design element draws inspiration from traditional forms seen in cast iron kettles (tetsubin) made in Japan’s Tohoku region.

By adopting this conical shape in the teacup, the design improves grip and usability. The slightly narrowing form toward the rim naturally brings the nose and mouth closer, enhancing the experience of aroma during drinking.

This thoughtful design, which highlights aromas, is ideal not only for tea but also for coffee and cascara cherry tea, allowing you to fully enjoy their aromas and flavors. The Frustum Series, both beautiful and functional, transcends the category of traditional teacups and enhances everyday moments of relaxation with coffee.

Size: W80×D80×H62㎜/ D85×W95×H75㎜ w/package

Weight: 130g/ 190g w/package

Capacity: 180cc

Made in Japan

• This product is dishwasher-safe and can be used in a microwave for reheating purposes.
• It is not suitable for use in ovens or over direct flame.

• This product is made of porcelain. Compared to earthenware, porcelain is harder and more resistant to impact, offering excellent durability.
• Due to the nature of the raw materials (clay and glaze), each piece may have slight variations in size, shape, texture, and appearance. Please enjoy these subtle differences as part of the unique beauty of porcelain.
• Depending on the firing conditions, the maker’s mark on the bottom may be faint or partially obscured. This is a natural characteristic of ceramic production.
• Please avoid sudden temperature changes or physical shock.
• Do not use metal scrubbers or abrasive cleaners, as they may scratch the surface.
• Please note that the outer box may occasionally have slight dents or creases due to handling. However, this does not affect the quality or condition of the product itself.