Sure Grip Cup Set of 6These polycarbonate cups are easy to hold for those with small or weak hands. They can hold cold or hot drinks, are dishwasher and freezer safe, and are PVC free. The Sure Grip Cup also comes with a drinking lid which has a small opening for easy flow of liquids (such as juice, water, milk). The valve in the top of the lid makes it easier to drink while in a lying down or inclined position. Push with two fingers on the tiny holes on the top of the lid