Pulagi mu mapepala a polycarbonate amapangidwira kuti azigwiritsidwa ntchito mosiyanasiyana, okhazikika, komanso okhazikika panja, amasintha mawonekedwe akunja ndi magwiridwe antchito akunja okhala ndi mayankho osinthika, osagwirizana ndi nyengo omwe amakweza mawonekedwe amipangidwe akunja.