Pearlescent Bulgy Mug, Mother of Pearl, Lustre Petrol Drip, Oil Slick Cup, Tea Coffee Lover, Unique Ceramic, Iridescent Opalescent Mugs The Mug holds around 10 fluid Ounces for the serious hot drink lover Designed in my oil slick drip design, to get this these are fired twice. Once to 1000°c the other to around 800°c. First the item is painted with Matte Black on the outside with shiny black drips and inside. It is then re-fired with lustre covering the drips to give this a petrol effect. Mug Height - 10cm Holds 10 fluid oz Check out my other items in my ETSY shop to see other items in this design Please notes that each item is hand painted and will be slightly different. The same process is followed for all of my Galaxy designs but each will be unique. Not suitable for dishwasher or microwave use.