Kalulu Wokongola Wokhala ndi Zoseweretsa Zofewa za Mazira Owala, kutanthauza kuti zidole za kalulu zofewa zokhala ndi mazira owala, ndi zoseweretsa zokongola komanso zosangalatsa kwambiri. Kalulu wofewa wofewa ali ndi mawonekedwe okongola komanso okongola, ndipo dzira lomwe limabwera nalo lili ndi chipangizo chowunikira chomwe chimatulutsa kuwala kofewa mumdima, zomwe nthawi yomweyo zimakopa chidwi cha ana.