Ma mua o ka hana ʻana i kahi nīnau, e ʻoluʻolu e hāʻawi i kēia ʻike i hiki iā mākou ke ʻike maopopo i kāu mau pono maoli:
1. Nui
2.Size hoʻomanawanui
3. Mākēneki māka(35-N52(M,H,SH,UH,EH,AH))
4. Coating (Zn, Ni, Epoxy, etc.)
5.Magnetic kahua kuhikuhi (Axial, Radial, mānoanoa, etc)
6. Ka nui
7. Ma hea a pehea ʻoe e hoʻohana ai i ka magnet