1.High quality stainless steel outer pipe, PVC anti-burst inner pipe. 2.Anti-corrosion and with high temperature resistant. 3.Thickening nut provides solid protection, refused to crack. 4.Silicone sealing rings, non-toxic and tasteless, prevent from leakage. 5.Double interlock and copper core interface design, anti stretching and no easy to separate the pipe from showerhead. 6.Standard G1/2 inch interface, about 2cm in diameter, is suitable for the majority of families.