mug black, cork bottomed insulated coffee mug/insulated tea mug with lid - 12 oz coffee mug with handle & splash proof lid- beautiful, black matte finish with anti-slip cork bottom (s/2) the outdoor optimist two 12 ounce coffee mugs included. this beautiful, sturdy ceramic coffee mug with lid has a cork bottom which acts as a built in coaster, preventing mug sweat and table rings. two 12 oz coffee mugs included. this beautiful, sturdy ceramic coffee mug with lid has a cork bottom which acts as a built in coaster, preventing mug sweat and table rings. the ceramic mug with lid to keep keeps beverages warm. you can easily remove to use the mug without the lid. the large coffee mugs should be hand washed. makes a perfect gift for mom, grandma, teacher, parent or any one who loves coffee or tea