OKU LETTER Mini Letter Set / SEED Design:Rice Bowl ROKKAKU × ob1toy collaboration: A

ROKKAKU × ob1toy collaboration: A special collaboration blending ob1toy’s retro illustration style with ROKKAKU’s signature foil-stamping techniques

specialists in paper container engineering

The 2026 eric × kleid Ring Diary is the second collaboration between eric

Specification Details Calendar Size H 433 × W 307 × D 10 mm Pages 12 monthly sheets Included Item MD pencil (B grade) attached via rubber holder Paper Material MD paper (high-quality

Listed in Japan’s GPN Eco-products database and compliant with the Act on Promoting Green Purchasing

OKU LETTER Mini Letter Set / SEED Design:Rice Bowl ROKKAKU × ob1toy collaboration: AEach sheet doubles as its own envelope, so there is no separate mailing sleeve to track down. You write, fold, seal with the included sticker tabs, and drop it in the post. Illustrated stickers featuring sushi, rice bowl, and cat designs finish the look and let you personalize the message for whoever is receiving it.