Each coaster is formed by hand from raw clay, hand painted, then fired in an outdoor kiln to over 2000F. Molten hot, it is plunged into a pit with mesquite shavings, igniting a blaze, making each coaster entirely unique. Made by Artist Jeremy Diller, Raku Potteryworks in USA. Each coaster is approximately 4″ round with cork footings. All proceeds benefit the Corolla Wild Horses.