A na-eji tubes gbara ọkpụrụkpụ 3mm eme ihe kwụ ọtọ, ebe tubes ndị ọzọ na-eji ọkpụrụkpụ 2.5mm, na-eme ka nkwụsi ike na ntụkwasị obi n'oge eji.
Echiche imewe usoro CENTER-BASED dabere na mkpa maka idozi ala naanị, na-enye ohere itinye n'etiti etiti ihe owuwu ma ọ bụ ụzọ.Ewubere ya n'elu shelf nchekwa ọtụtụ ọkwa, ọ na-ebuli ọdụ ọzụzụ dị iche iche na-arụ ọrụ yana itinye ohere.
