Aqua Harmony Water Cup - Set of 6 The Moon water glass is break resistant and perfect for outdoor entertaining. Complete the collection with glasses and pitchers with the same color. Size: 3-3/4" H/3-1/4" Dia. COMPOSITION: 60% Acrylic + 40% Polystyrene (MS) INSTRUCTIONS: Not suitable for liquors and for warm beverages or microwave use. 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.