Universal Cast-Iron Round Burner Head: It is made of high quality cast iron and has better heat resistance than conventional aluminum burners. It also has air shutter for better ventilation to the propane can thorough combustion. You can use it with high pressure regulators. Built in Air Shutter: It also has air shutter for better ventilation to the propane can thorough combustion and prevent your griddle, pot and all other coolwares from darkspotting. Brass Fitting: 3/8inch flare M x 1/8inch MNPT high quality brass. Application: Fits most propane grill, stove, smoker, burner, heater, fireplace, fire pit, cooker, turkey fryers, torches and variety of high pressure appliances. Attention: It can only be used for propane. And it is suitable for high pressure system. Please do not use for low pressure equipment to prevent damage to your low pressure equipment. Colour:silver Material:cast iron, brass Package Contents: 4 x High Pressure Propane Cast-Iron Round Burner Head Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.