There are 6 stackers in a box, enough to stack set of 12 mugs, cups or glasses. Save space by stacking Mugs, Cups and Glasses on top of each other without the risk of chipping or breaking them. Drinkware Stackers are adjustable, they work on various sizes and shapes of drinkware. Only product on the market that allows you to "safely" stack your drinkware, without the risk of chipping or breaking your mug, cup or glass. Elypro's Drinkware Stacker & Coaster is an adjustable stacking device which doubles as a coaster to help you easily and conveniently organize your kitchen cabinet shelf. Taking advantage of all that unused airspace between your drinkware and the shelf, the Drinkware Stackers lift your cups, mugs and glasses on top of each other without the risk of chipping or breaking them, utilizing the area that would normally go to waste. It's like discovering a whole new cupboard. These mug and cup Stackers are totally adjustable, so no matter what size your glasses happens to be, it will save you space for more dishes, more glasses, more of whatever you need to stash on your cupboard shelf or shelves. It's very easy to use, just place one Stacker on top of a glass, mug or cup, then set another one upside-down, right on top. Give the Stacker a little squeeze to adjust to the size, and your drinkware is safe and sound, in just the right amount of space. You can even use them as coasters. With its colorful high-tech look and three patented expandable feet, the Drinkware Stackers & Coasters keep your drinks safely away from furniture without scuffing, scratching or marring the finish.