1. Siv cov khoom siv hluav taws kub, muaj kev nyab xeeb siab.
2, Kev ua haujlwm siab, PC khawm, silicone waterproof nplhaib, stainless hlau plhaub, tiv thaiv corrosion thiab plua plav-pov thawj
3. Daim ntawv thov dav dav.
Cov khoom siv tau rau hauv kev lag luam rooj tog, kev thauj mus los, cov khoom siv kev nyab xeeb, cov khoom siv hauv tsev, cov khoom siv kho mob, cov khoom siv hluav taws xob, lub tshuab pib, kev tswj kev nkag mus thiab lwm yam.