1)We use SUS304 stainless steel material to make our products. All metal parts of our faucet are made of this material, even the screws. It will never rust. 2)We apply precision casting method to finish the main body of our faucet. Thus we can grant you a five years guarantee for the faucet body. 3)We use good quality cartridge and aerator for our faucets. (Sedal cartridge and Neoperl aerator)