These fun LED coasters automatically light up when you place a drink on them, giving an other-worldy look to clear drinks. Each coaster is 3 3/4″ x 3/4″ and made of acrylic and ABS plastic. They’re non-toxic, and safe to use in bars, restaurants or at home. Place a glass vase, bottle or vessel on them to create a unique atmosphere to your event or party. Add your business logo or message to create a unique party premium for all occasions. Choose from five colors.