Think Outside That's it, just think outside. These ThinkOutside coasters use the best materials and are made through a process called dye sublimation to produce high definition, beautiful, practical and unbreakable coasters. Made of 100% fine weave polyester, these nature coasters have a base of closed cell natural rubber. Moisture will not soak through these 4" coasters, nor will the image crack, peel or fade. If they become soiled or stained, hand wash with soapy water or treat with bleach. Individually Designed & Printed in the U.S.A.