(4) - 5" dia. x 6mm : Upcycled coaster set - Always handmade in the USA with recycled neoprene and other hard to manage scrap. This is just one member of the Lava Rubber family. Be sure to checkout our other goods made from : recycled wetsuits, gaskets, weather stripping, compressions sleeves, aluminum juice pouches & yoga pants. Each mat saves valuable "waste" from entering a landfill.