Each It's OK to be a little Nuts coaster uses the best materials and are made through a process called dye sublimation to produces High Definition; beautiful, practical and unbreakable coasters. Coasters are 100% fine weave polyester and base is closed cell natural rubber. Moisture will not soak through these 4" coasters. The image will not crack, peel or fade. If they become soiled or stained hand wash with soapy water or treat with bleach.