The CLEAR water glass is highly stable thanks to its non-slip base. It is made of TRITANâ¢. This material is practically unbreakable and with its shine and transparency it will bring elegance to your table as well as remaining secure during meals. The collection of non-slip glasses includes the Wine Glass, Champagne Flute and Water and Beverage glasses. Size: 3-3/4" H/3" Dia. COMPOSITION: 100% Copolyester (Tritan) INSTRUCTIONS: Not suitable for microwave. MAINTENANCE AND CLEANING: This product is dishwasher resistant (top rack only). However, it is advisable to wash it by hand, gently and with neutral soap in order to maintain the transparency. Set of 6 Non-Slip Ring Great for outdoors | Non-Slip Clear Water Glass, Set of 6 in Champagne