This 9 cm square coaster is hand-stitched for durability. One side features natural veg-tan leather, which initially repels moisture and develops a rich patina over time, making it ideal for cold drinks. The reverse side is dyed with kakishibu (persimmon tannin), offering a warm color and water-resistant properties, perfect for hot drinks. The thoughtful use of natural materials reflects the studio’s dedication to sustainability and practical elegance.