The Norlan Glass was designed with the intention of enjoying whisky neat. That being said, you can do whatever you like with the glass once you get it, including using Ice. Just be mindful that the cubes must be gently placed into the inner bowl; we cannot be held responsible for breakage from ice being dropped into the glass. And if you plan to use an ice sphere in the glass, note that the narrowest aperture of the inner bowl is just over 2". Due to slight variations in each glass, we cannot guarantee that a 2" sphere would fit.