These tumblers can be nudged, bumped, or glanced yet will never topple. The stout tumblers have weighted, perfectly round bases that are much heavier than the rims, allowing them to pitch up 90º in any direction and quickly spring back to an upright position. The tapered mouths help keep liquid inside as they teeter, and the tumblers' round bowl fits comfortably in the palm of a hand. The tumblers are mouth-blown by Euoropean artisans using the same techniques that have been used by glass blowers for hundreds of years. Dishwasher safe. Set of Four. 8 1/2-oz. capacity. 3 1/2" H x 6 1/2" Diam.