Akwai nau'ikan gwangwani iri-iri, Misali, kwandon shara da ake amfani da su wajen tsaftar tsafta da tsaftar tsarin tsafta, manya-manya girmansa, kwandon shara na 240L ya ƙarfafa jujjuyawar juzu'i da murfin guga mai gyara ramuka. in mun gwada da bakin ciki ganuwar, Sauƙi don ja nakasawa, Easy saman nakasawa, Kullum ta yin amfani da filastik mold hadedde allura gyare-gyaren gyare-gyare, Amma sharan iya sassa ne sau da yawa saboda bayan kafa, sanyaya shrinkage, Ctightly a kusa da core, A kan aiwatar da moulmolding, Saboda da babban yanki mai ƙarfi na bangon gefe, Sanya babbar juzu'i tsakanin samfurin da saman jigon ta wanzu, Lokacin da aka fitar da sandar saman daga cikin samfurin, Yana da wahala a fito fili, Lankwasawa Thimble, Thimble saman samfurin daga cikin Saitunan lahani na farin digo zuwa saman samfurin.