All Rivelins fires are designed for the outdoors. We use only the hardest wearing most suitable materials. The Lisbon gas fire table comes with a choice of Group one Ceramic as standard. Further ceramic table tops are available at additional cost. Ceramic tops are "Man Made" and represent the latest worktop technology. They are heat resistant, UV resistant and highly resilient against scratching. In addition they are "Zero" maintenance requiring no annual sealing. GP4 ceramic tops have a polished surface, GP1, GP2 and GP3 ceramics have a matt finish.