Thank you for viewing my product! This is a laser-engraved diatomaceous earth coaster with a design created by an amateur. The diatomaceous earth absorbs the condensation from cups. How about it as a gift? The back is shown in the second photo. Please understand that this is a handmade item before purchasing. Below are the measurements taken by an amateur, please use them as a reference. Side length: 5cm hexagon Please read the profile before considering a purchase. I have other items for sale, so please feel free to take a look. #diatomaceous earth #coaster #handmade goods #laser engraved