NOVICA, in association with National Geographic, works together with talented artisan designers around the world to produce stunning, keepsake treasures. Our mantra is to spread global happiness, so rest assured - we’ll do everything we possibly can to ensure you’re a happy customer. About this item: Streams of emerald green and cobalt blue bring elegant energy to a set of six tumblers from Mexico's Javier and Efren. Each glass is individually crafted by hand with millenary blown glass techniques. Because each piece is handmade, shape and size can vary slightly and tiny bubbles may appear within the glass. This exemplifies the hand-blown technique, making every piece a unique example of blown glass craftsmanship. Each glass holds 11 oz. - Dishwasher: use top rack only. Hand wash recommended. - Free of lead and toxins - This hand blown item may vary slightly in color, size and shape About our Artist: 'This type of work is a beautiful craft. I love blown glass because of the pure imagination poured into every piece created, " confides Efren. Working as a team, Javier specializes in the design of the pieces, and Efren transforms the designs into a reality. 'Efren and I make a great team. Over the years we have worked hard to design truly original styles with a distinctly Mexican accent, ' says Javier.