Handblown Double-Wall Colored Glass Tumbler

Inner diameter: 3.34 inches; overall height: 4.95 inches. Constructed from high-purity borosilicate 3.3 glass, renowned for its low thermal expansion and mechanical strength. Double-layered wall design provides natural insulation and enhanced visual dimensionality. Colour is embedded within the glass matrix during blowing — not applied as surface coating. Features a seamlessly integrated, heat-resistant handle shaped for prolonged grip comfort. Every unit is hand-formed, yielding gentle variations in thickness, curvature, and hue intensity — a hallmark of true craftsmanship. Fully dishwasher safe (top rack recommended), non-reactive, and odour-free. Ideal for hot infusions, espresso-based drinks, chilled herbal tonics, smoothies, or layered mocktails.