The glass is a lead-free formula of silica, lime, pot ask, and barium that starts out as pellets, but begins to take new shape when heated to approximately 2400 degrees. The high-quality materials are surpassed only by the superior talent of these master artisans, resulting in some of the most beautiful, clear, and strong glassware available. Not only are these pieces designed and made to be gorgeous pieces of art, but each piece is made to be used every day. Made in the USA in Vermont and Maryland.