Xaiv cov khoom siv.Cov ntaub ntawv phuam da dej feem ntau yog stainless hlau, aluminium alloy, zinc alloy thiab tooj liab thiab lwm yam 4 yam.Stainless hlau yog pheej yig, corrosion kuj zoo, tab sis cov qauv tsis nruj, stability tsis zoo txaus;Aluminium alloy thiab zinc alloy nqi yog siab dua, stability zoo dua stainless hlau;Tooj liab yog qhov kev xaiv zoo tshaj plaws rau kev ruaj ntseg, hardness thiab gloss, tab sis nws tuaj yeem kim dua li nws.Yog li da dej hinges rau iav qhov rooj