The thermostatic shower valve is made of brass of grade A and the handle is made of zinc alloy leading to performance of corrosion resistance and abrasive resistance. Guoren is an enterprise with over a decade's worth of experience in the engineering and production of thermostatic sanitary ware products from thermo-sensitive elements and cartridges, to beautiful faucet sets for high end bathrooms. We are certified by European CE, England WRAS & TMV2, Australia Watermark and France ACS.