Epicurean  Coasters, 4-Inch by 4-Inch, Natural/Slate, Set of 4 Set of 4 natural/slate coasters; each coaster measures 4" x 4" Modified natural material is lightweight, durable, nonporous, knife friendly and dishwasher safe, and easy to maintain; NSF approved Attractive and functional with integrated groves to collect condensation; natural color coaster with slate grooves Made in USA from trees harvested under the guidelines of the North America Sustainable Forestry Standards Temperature resistant to 350 Degree F/175 Degree C