Cov kab xev, kuj hudaim kab xev, yog ntaub-los yog scrim-backed siab-sensitive daim kab xev, feem ntau coated nrog polyethylene.Muaj ntau yam kev tsim kho uas siv cov nraub qaum sib txawv thiab cov nplaum, thiab lo lus 'kab kab xev' feem ntau yog siv los xa mus rau txhua hom ntaub ntawv sib txawv ntawm cov hom phiaj sib txawv.