Zotulutsa zowotcha zosaphulika ndizo kawirikawiri amapangidwa kuchokera ku aluminiyamu alloy, zomwe zimapereka katundu wodalirika wosaphulika. Kwa malo omwe amafunikira kukana kwa dzimbiri, fiberglass ndiye chisankho choyenera. Zida zonse ziwiri, aluminium alloy ndi fiberglass, ndi othandiza poonetsetsa kuti chitetezo chitha kuphulika.
Iwo amapereka mphamvu zofunika ndi durability, komanso kuthana ndi zovuta za chilengedwe monga zinthu zowononga kapena zovuta kwambiri. Kusankhidwa kwawo ndikofunikira pakusunga kukhulupirika kwa ma fan system komanso chitetezo chamadera ozungulira, kuwapanga kukhala abwino kwa ntchito zambiri zamafakitale.