This Listing Is For A Pair Of Car Coasters Ceramic With Cork Back Measure 2.6" X 2.6" & 1/4" Thick Durable Material: made from a good absorbent ceramic stone that can easily absorb the water outside the cup. Hard Board With Cork Back Measure 2.75" X 2.75" & 1/8" Thick High quality MDF hardboard with cork back, hard and not easily damaged.