I-coil iron base material egoqiwe ebandayo ayiyona ialloy low carbon steel, ukutholakala kogqinsi kungu-0.12mm kuya ku-3mm (11gauge kuya ku-36gauge).Ububanzi bekhoyili buyi-500mm kuya ku-1500mm.
Ihlukile kumakhoyili ashisayo agoqiwe, amakhoyili ensimbi abandayo abhekisela kukhoyili yensimbi egoqwa ngokuqondile ibe ugqinsi oluthile ngerola ekamelweni lokushisa Uma eqhathaniswa namakhoyili agoqwe ashisayo, amakhoyili agoqekayo anendawo ekhanyayo futhi ehlanzekile.