Razor hlau yog ib yam khoom siv ruaj ntseg uas nrov thoob ntiaj teb.Nws tseem hu ua concertina hlau los yog barbed daim kab xev vim nws cov duab.Nws muaj cov hniav ntse thiab cov hlau sab hauv.Nws yog dav siv nyob rau hauv lub Hoobkas, tsev loj cuj, txhab nyiaj, mineral cheeb tsam, ciam teb los yog lwm qhov chaw kom tsis txhob muaj kev txhaum cai nkag mus rau kev ruaj ntseg thiab kev tiv thaiv.