1. Khoom siv: 430 stainless hlau, thickness 1.2mm 2. Diameter: 1270mm Advantage: Huab cua loj, tsis muaj deformation, tsis tawg, tsis muaj plua plav, txaus nyiam thiab ruaj khov. Lus Cim: Cov khoom siv hniav kuj muaj cov ntawv galvanized, aluminium alloy rau kev xaiv.