Promotional Aqua Coaster is a welded coaster containing 2 or 3 non-mixing liquids, these novelty liquid filled coasters are available with your choice of liquid colours. Add glitter for extra interest (extra cost). Due to nature of PVC material some distortion with heat can occur particularly if used with plastic vending-machine cups. Please ask for samples before deciding which coaster is most suitable for you. Please Note: During welding, air bubbles are trapped inside the mat so that when in use, they give the illusion of an extra liquid.