New from Portion Perfection this set of 2, Hand-blown, Lead Free Premium Crystal Glass Wine Glasses will take the guess work out of counting calories while you enjoy a glass of your favourite wine. Complete with a 100 Calorie = 150ml Plimsoll line applicable for red, white or sparkling wine. The wine glass with ounces marked allows you to pour straight into the glass without the need to measure calories and ounces separately before transferring. Whether you're a weight watcher or have had bariatric surgery this measured drinking tumbler with lines is designed to remove any estimating or extra accessories for you. Unlike stemless glasses you are able to hold the glass by the stem and not warm the wine. Being made from lead free crystal glass the glasses will not discolor or take on odours like plastic or acrylic products may do over time and repeated diswasher use. This measurement is approximately correct for a standard drink however wines come in varying alcohol concentration so this guide should not be used as a standard drink measure. patent pending