Icya kabiri, igifuniko cyongera ubwiza bwikintu. Irashobora gutanga neza, kurabagirana cyangwa matte kurangiza, bitewe nurangiza wifuza. Ibi bituma ikintu kirushaho gushimisha no gushimisha. Ipitingi nayo ifite ibyiza byo gukora. Irashobora gutanga insulasiyo, ubwikorezi cyangwa kurwanya abrasion, ubushyuhe cyangwa imiti. Ibi bitezimbere imikorere nibikorwa byikintu cyangwa ibikoresho. Ibintu byingenzi biranga impuzu zirimo guhuza kwinshi no guhuza ibikoresho bitandukanye. Irashobora gukoreshwa mubyuma, plastike, ikirahure, ibiti, ndetse nigitambara. Ukurikije imiterere yikintu cyangwa ibikoresho, impuzu zirashobora gukoreshwa muburyo butandukanye nko gutera, gukaraba cyangwa kwibiza.