Serendipio Sienna Cork & Ceramic Coffee Mug - 340mlthe cork base of this ceramic mug serves as a built in coaster, insulating the heat of the liquid inside from the surface of a table or desk. The removable slider lid helps to prevent spills, and also helps to keep your drink warmer for a little longer. The mug can be laser engraved, which provides a more subtle and long lasting branding opportunity for your logo or message. 10. 9 ( h ) ceramic & cork 340ml not dishwasher and microwave safe packaged