LIVIA Premium Quality Valve Seat Inserts are made of special composition alloy steel to withstand extremely high temperature in combustion chamber of four stroke engines, using natural gas, L.P. gas, lead free fuels etc. Due to the high alloy contents and excellent heat resistance properties, LIVIA - Valve Seats Inserts are able to dispose the heat surrounding the engine valves. As during the running of all four stroke engines, the engine valve contacts the valve seat inserts for a very short moment, it is only when the head of the engine valve has a chance to transfer the heat to the valve seat.