Set of four stemmed liqueur glasses that are guaranteed! Crescendo stemware is machine blown and made in Luigi Bormioli's proprietary SON.hyx material. SON.hyx produced glassware is an exciting fusion of elegance and technology. Glassware made in SON.hyx is extremely brilliant in color, has a beautiful sound, and maintains clarity after thousands of industrial dishwashing cycles. Luigi Bormioli has developed an unprecedented guarantee program for these glasses!