Concertina hlau muaj qhov zoo nkauj hla kev pom thiab nws yog qhov tsim nyog rau kev siv tom qab txuas ntxiv, ua qhov zoo tshaj plaws kev ruaj ntseg fencing nrog zoo tiv thaiv-nce thiab tiv thaiv kev txiav.Cov ntaub ntawv txheem yog galvanized lossis stainless hlau.