Decorate your home with custom drink coasters! Simple, yet substantial, these
coasters will look great in any room in your house. Made to keep your tables
scratch-free, our custom sandstone coasters have a cork backing, so you can use
them on any surface. These coasters have a matte finish and work best with
vintage illustrations, black-and-white photos and personal text messages.
Caffeine is a bitter, white crystalline xanthine alkaloid and a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants, as well as enhancing the reward memory of pollinators. It is most commonly consumed by humans in infusions extracted from the seed of the coffee plant and the leaves of the tea bush, as well as from various foods and drinks containing products derived from the kola nut. Other sources include yerba maté, guarana berries, guayusa, and the yaupon holly. (via Wikipedia)