GROSCHE Istanbul Hand Made Double Walled Shot Glasses Set of 4 - 4x90ml/3 oz. 100% borosilicate glass beaker: safe for hot liquids and flavour-neutral Naturally BPA and lead-free. Double walled glasses are not recommended for microwave use Sturdy and easy to hold Dishwasher safe - To prolong life of glass, we recommend hand washing The Purchase of this product will create 5 days of safe drinking water for someone in need through the GROSCHE SAFE WATER PROJECT - For more information, please visit the manufacturer's website at www.grosche.ca/safewater