Thirstystone Coasters for hot & cold drinks. Available in a variety of Native American designs. Oak Coaster Holder optional. (the mug in the photo is for display purposes only) Made of Arizona sandstone, these coaster sets are liquid thirsty pieces of art that are not only practical but beautiful as well. They will please just about anyone on your gift list. 4" (10cm) diameter, .25" (.6) cm thick.