Epicurean Coaster Series 4-Piece Set - Natural/Slate Use with hot or cold beverages; 2 color combination with a side profile pin stripe design Measures 4 inches by 4 inches by 3/16 inches thick; natural exterior, slate core interior Reversible design features a geometric side and a plain solid surface side; NSF approved; dishwasher safe Made in USA from trees harvested under the guidelines of the North America Sustainable Forestry Standards Company ECO Initiative Commitment: Greenguard Certified, classified "Green" product; uses sustainable manufacturing practices; minimal recyclable packaging