It's Not A Dad Bob, It's A Father Figure, Fathers Day Gift, Personalized 16oz Pint Beer 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. Care instructions: Clean in dishwasher (put the product on top rack), or wash the product by hand with warm water and dish soap.