Ordinary cup holders are difficult to clean, and seem to catch all kinds of crumbs and other debris. These coasters catch and hold messes others can't, allowing you to lift them out with ease when it's time to clean. Four (4) coasters per pack. Includes: two (2) large coasters measuring 3-7/16" in diameter and two (2) small coasters measuring 3-1/8" in diameter. Each support a 5/8" high flared sidewall. Fits the bottom of virtually all factory vehicle cup holders.