Cap almost any glass with this universal beverage cap. The Universal Cap stretches to fit many cups from 2.75 – 3.75 inches. Made from 100% non-toxic food-grade silicone, it allows you to create a spill resistant cup out of almost anything you have in the house already. Take your drinks, juices and smoothies in the car, the pool, to the soccer game or anywhere you go. The outer ring stretches and flexes to fit large cups, the second ring stretches and flexes to fit medium cups, and the smallest inside ring for small cups. It keeps beverages carbonated longer and delays the oxidation of fresh smoothies and juices.