Non- Slip Wine Glass - Set of 6 The clear wine glass is highly stable thanks to its non-slip base. It is made of Tritan. 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: 8-1/4" 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.