CARE OF RESIN ITEMS  The resin used in coasters is heat resistant only UP TO 70 degrees Celsius  Wipe clean with a lightly dampened cloth only  Never wash or use harsh chemicals or abrasive cloths  Not dishwasher safe All of my items are Australian handmade in my small home based studio. As a result of the process in which they are made some irregularities and imperfections such as micro bubbles may present and each piece is truly one of a kind.  It is advisable to store resin products out of direct sunlight as too much heat can cause the resin to discolour and/or soften and warp.