PLS Set of 12 x Premium 330ml Spirit Glass Drinkware. Made from High Quality Polycarbonate, Stylish & Crystal Clear and Vitually Unbreakable. Freezer & Dishwasher Safe. Our NEW SERENO range ofQuality Polycarbonate Drinkware allow cold drinks to be served and remain at a cool serving temperature for longer than drinks served in conventional glass or ceramics.