Sailor Soul Water Glass - Set of 6 The Sailor Soul water glass is made of MS, a top quality, shock-proof and break resistant material that is also difficult to scratch. Size: 4-3/4" H/3-3/4" 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.