1. Babu wutsiya tube, guda tube da kuma guda dubawa zane.
2. Ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan ƙira ɗaya ne, wanda yake da sauƙin tsaftacewa, ana iya aiki da shi a ƙarƙashin matsin lamba, kuma yana cikin wuri tare da dannawa ɗaya.
3. Filastik da ba zamewa iko iko, babu mai mannewa ko m, yin aiki mafi daidai.