These Stelton Foster tumblers are super easy to use. You can fill them with water, juice, or your favorite drink. For daily use, just place them on your dining table. For parties, they'll look great on the bar. When it comes to cleaning, you can wash them in the dishwasher or by hand with mild dish soap. Just be careful as they're made of glass, so avoid dropping them. Store them in a dry place to keep them in good condition. If you're not satisfied with the product, you can return it within 30 days.