Luigi Bormioli Intenso 18.5 Ounce Young Red Wine Glass, Set of 4 Glass construction Innovative glass making techniques produce perfectly smooth rims and edges SON.hyx material ensures the glasses are extremely break resistant and transparent Dishwasher safe +37.5% Resistance of the rim +105% Resistance to impact test +98% Resistance to twisting of stems Sound amplifier Lead and other heavy metal free Produced with low CO2 emission level Guarantees the stems resistance to breakages even after multiple industrial washing cycles Glass sparkle and transparency is maintained Avoids any glass discoloration. purest raw materials, advanced and friendly melting processes highly innovative production processes, enable the achievement of a glass: extra pure and totally transparent, sparkling, longer lasting, resistant to breakage.