Acrylic coasters. Shatterproof, with anti-slip feet (see photo). Heat resistant up to a maximum of 90 degrees. Do not use abrasives or knives. Wipe clean with a damp micro cloth. Coaster Overall Size: 100 mm. All measurements are at longest points, the shape is cut out of the overall size. Cut from 3 mm thick acrylic. All products are supplied with a protective covering, which needs to be removed before use.