Inkqubo ye- Iibhola ezithwele iintsimbi amkele umgangatho ophezulu ocociweyo wokucoca isinyithi esikhethiweyo, kwaye ubuchwepheshe bokuqhubekeka kwinqanaba lehlabathi liphezulu lamkelwe. Iibhola zentsimbi ezichanekileyo eziphezulu ezivelisiweyo ziyahambelana nabenzi abaninzi abadumileyo bamanye amazwe. Iibhola zentsimbi ezithweleyo zinobulunga obuphezulu bomphezulu, ubunzima obuphezulu, kunye nomthwalo omkhulu othwala umthwalo. Inkqubo ye- Ukuchaneka okuphezulu kwiibhola zensimbi zisetyenziswa ngokubanzi kwiibheringi ezichanekileyo, izikrufu zebhola, oomatshini bokuchaneka, kunye namanye amasimi.