FIT ALL KINDS: Great for bourbon, highball, lowball, whiskey glasses, coffee mugs, tumblers, flasks, mason jars, and large fountain drinks. TABLETOP PROTECTION: Prevent condensation from leaving any stains or water marks on your countertop, bar, or tabletop surface. NON-SLIP DESIGN: Soft foam pads at the bottom to protect your furniture surface from slipping and scratching. ECO-FRIENDLY: Unlike paper or cardboard coasters, these slate coasters are reusable; clean as needed with a damp cloth and towel dry for best results. HOUSEWARMING GIFT: Wonderful and special gift for your families, friends, colleagues, lovers, neighbors.