Coaster set is made of ceramic and cork,it can prevents scratching,allows cups to never slide off,protect your cups more safely. Round coaster size is 3.9 inch diameter and 0.3 inch thick.This size is suitable for all type cups.We provide you so many unique patterns,each of pattern can makes your home decoration beautiful and wonderful.When the holiday comes,you can choose this coaster as a gift to your family,friends,classmates.Such as Birthday,Christmas,Housewarming Party,Valentine’s Day and so on.