Coasters made with sustainably sourced cork that’s been naturally smoked from Liga's Designer Collection. Sold in sets of 4 only Cork is harvested once every nine years without felling trees. This means our placemats and coasters enhance your home while allowing endangered wildlife to keep theirs. Cork also continues to absorb CO2 even as a LIGA product. Coaster sets are presented in a simple eco band, making the perfect gift. Wipe Clean with soapy water. They can withstand a warm mug or plate only.