Kits na wasan karkatar da ke ƙarfe suna canzawa hanyar aikace-aikacen yin tattaye. Wannan kits na ba da tsauri, tushen da karkara, kuma na iya canza wani yanayi, sai dai don amfani da su a wani irin wasan jiki, wasan ganye da takurdu, da sauransu. Amfani da fahasa mai zurfi ya garanta cewa waɗannan abubuwan suna iya taka leda akan harshen farko idan aka samu da shagunan cikin su. Muƙallamun kamiyaya mu na da nau'ikan girman da karkara, don mutum ya zabi wacce cewa ta fitowa a cikin abubuwan da ya buƙata. Ta hanyar production line mai siyarwa, muna garanta cewa akwai ma'ajiyar a matsayin daya daga cikin abubuwan da ke cikin, don garanta cewa proses din yin amfani ya kasance rere. A gefe, ala'alwar mu zuwa kan taimakon ya nufi cewa wasan kamiyanmu na karkatar suna hadawa da masu amfani da gudun zamfara, don nema cewa za a rage wasan kimi da harcin da ke cikin yin su. Wannan shine zafin a cikin zaɓin waɗanda suke so su rage karbon na zamfara.