Luigi Bormioli Set of 4  Classico Double Old Fashioned Glasses, One Size Made with son.hyx technology Dishwasher-safe; made in italy The ingredients of son.hyx allow the glasses to be more brilliant in color and sound, increase their durability and strength. 25 year guarantee covers rim and foot chipping as well as discoloration +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 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.