Similar to: Ishizuka Glass Tsuyoiko Tumbler

These borosilicate tumblers bring scientific-grade durability to your morning coffee or evening cocktail. While the six-ounce capacity is modest, the striking cobalt hue and thermal resilience make them a sophisticated, everyday essential that elevates the simple act of drinking.

This hand-blown borosilicate vessel turns your daily hydration into a tactile experience with its vibrant, bumpy texture. While the artisanal glassblowing process means no two cups are perfectly identical, that slight inconsistency is exactly what gives this double-walled piece its undeniable charm.