Ejiri obere ụfụfụ mechiri emechi nke na-anaghị ekpuchi mmiri mee FRP crossbar nke e ji obere foam nke nwere ike imechi ihe, nke e ji ọkpọkọ epoxy fiberglass siri ike mee dị ka ahụ mkpuchi, nke nwere ihe mkpuchi O-lock a na-ekpuchi, yana ntọala mkpanaka aluminom dị arọ nke dị ike na naịlọn nwere sistemụ mkpọchi mkpanaka ratchet. Ngwaahịa a nwere njirimara nke arụmọrụ mkpuchi dị mma, ike igwe dị elu, obere ibu na ntinye dị mfe ma a na-ejikarị ya eme ihe na ngwaọrụ nkwado waya nwa oge mgbe a na-arụ ọrụ na ọkụ eletrik.