Igikorwa cyubwoko bwa FA1 butagira umukungugu ni ukurinda umukungugu, umwanda, umucanga nicyuma cyinjira, binyuze mubishushanyo bidasanzwe, kwirinda gushushanya, kurinda ibice byayobora, kuramba ubuzima bwakazi bwa kashe.Diameter yo kwivanga yemeza ko kashe yo hejuru yapakiwe cyane muri ruhago, bityo bikarinda kwibasira umwanda nubushuhe.Ubwoko bwa FA1 butagira umukungugu butanga icyumba gifunze kuri silinderi, idafite imigozi n’imigozi, itihanganirwa cyane, kandi idafite ibyuma bicomeka, birinda kwangirika nkimpeta ya skeleton itagira umukungugu.Grooves nayo ntisaba kwihanganira byimazeyo.