The drumis made of silicone rubber, fiberglassfabric as its reinforcing material, and wound wires as its heating element, with several springs as its fastener. For temperature controllingof drum heater, we have two types, one is adjustable for the temp. of thermostat witha hand knob,withtemp. regulator of both30C 150Cand 0 120C for your choice. another, integratedwith thermal switch,is un-adjustable for the temp. of thermostat. The standard spec.s: 1) size: 1740X250mm, 1900W/110V; 2) size: 1740X102mm, 800W/110V; 3)size: 1780X250mm, 2000W/220V; 4) size: 1780X180mm, 2000W/240V;