We do not recommend using a dishwasher for any crystal glasses. The Waterford Crystal Ardan Tonn Tumblers are perfect for Whisky, Gin and Tonic and indeed Water or anything else that takes your fancy. The round base sits easily and comfortably in the hand. This striking modern design is inspired by the rivers and streams that flow from the mountains to the Atlantic Coast near to the home of Waterford Crystal. These tumblers should be used for all occasions and not just kept for best. It will make drinking even more pleasurable