The surface of the product is made of high-quality Nylon plastic which is heatproof, high strength, insulative, damp proof and is not easy to break also. It is also with planting cauterized surface. These products have very good quality switches. It is with the separate planting silver technique. Some of them are with automatic power, a cut-off device that will cut the power if the product is overheating. It has double insulation protection, so it is very safe to use. low noisy.