<https://thewinebox.biz/product/riedel-optic-o-whisky-1-pair/#product>
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"The Whisky glass is perfect for complimenting any table setting, from elegant to casual.Optical O is based on the popular ‘O’ series of stemless wine glasses, designed by Maximilian J. Riedel, with optical blown glass that enhances its design. This pack contains two glasses. Machine-made and dishwasher safe."
<https://thewinebox.biz/product-category/accessories/whisky-glasses/>