The back of the coaster is an environmentally friendly cork cushion that helps prevent porcelain from scratching the table and has a NON-SLIP FEATURE that does not slip even on a smooth table. 【Breathing Ceramic & Strong Water Absorption】Made of natural cork cornerstone absorbing ceramics, helps to capture moisture in cold drinks, DOESN'T STICK TO YOUR GLASS and KEEP IT DRY, moisture prevention and mildew-proof. And is more absorbent and easier to clean than plastic coasters, JUST RINSE IT BY WATER. The back of the coaster is an environmentally friendly cork cushion that helps prevent porcelain from scratching the table and has a NON-SLIP FEATURE that does not slip even on a smooth table. (Set of 6) 6 different styles of patterns and colors , adopt advanced DIGITAL PRINTING TECHNOLOGY can keep the pattern bright and not fade. So that the cool coaster can be given as Birthday, Holiday, Christmas, Valentine's Day, Housewarming, Bar, College Dorm Room and Room Decoration gifts to men, women and friends.