Custom Mugs, Balsamo 12 oz Ceramic Mug with Cork Base - BPA Free, Ceramic construction with a natural cork base that is 85% cork & 15% polyurethane glue Matte exterior and glossy interior Rubber seal lid with sliding drink opening Natural cork bottom prevents furniture scratches, stains and provides a non-skid base Durable ceramic has a non-metallic taste, will not rust or stain Hand wash only BPA Free and FDA certified ... #DWA-BS22 $6.95/each.