I'm Sippin Up To Boston Pint GlassTwo in one: these mixing glasses are both shakers and serving glasses. Made from 100% glass, they're crystal clear and look sleek. The solid glass base also minimizes the risk of tipping and spilling the drink. They're more narrow at the bottom for a more comfortable grip and easier carrying. .: One size: 16oz (0. 473 l) .: Material: 100% clear glass .: Heavy solid glass base minimizes spilling .: Durable construction