"This set contains 12 pieces SPIEGELAU Authentis Sparkling Wine glasses. The elegant machine-made sparkling wine glass of the fine-blown glass collection Authentis ensures that the aroma and bouquet of drink is transferred to the taster in a perfectly authentic way. The gas does not escape and creates the "bubbly" liquid. These glasses are the result of highly specialized production processes combined with an in-depth understanding of wine appreciation. All SPIEGELAU glasses are dishwasher safe. "