The FiberFuse16 with Sentry Xpress 3-Key Controller is a square Ceramic Fiber Kiln with embedded Heating Elements in the Side Walls. It measures 16″W x 16″H x 6″D inside. The FiberFuse16 Kiln is rated to 1700°F. It fires on 120 Volts and needs no other heating source. Rated to 1800 Watts.