Z-LION PCD-21 3 theka la PCD akupera trapezoid ndi ntchito yolemetsa yochotsa zokutira pochotsa zokutira wandiweyani komanso elastomeric monga epoxy, urethane, polyurethane, polyaspartic, acrylic, glue zotsalira, ndi zina. batani lothandizira gawo.Imabwera ndi mbale wamba ya trapezoid, imatha kuyikidwa pazitsulo zingapo zapansi kudzera pamabowo atatu pa mbale ya trapezoid.Zapangidwa kuti zizigwira ntchito molunjika, motsata wotchi kapena mopingasa.