A fagen kera samfuri, kayan ƙarfe suna taka muhimmiyar rawa wajen kera samfura masu ɗorewa da madaidaici. Karfe irin su aluminium, karfe, da titanium galibi ana zabar su don keɓancewar ƙarfinsu, juriya, da iya jure ƙaƙƙarfan gwaji.