Isinyithi esikwisikwere luhlobo lwezinto ezinemilo eyahlukeneyo, ubukhulu kunye neepropathi ezenziwe nge-ingot, i-billet okanye intsimbi ngokuqhutywa koxinzelelo. Inokwahlulwahlulwa ibe kaloliwe eshushu kunye ehlelayo ebandayo; Ubude icala sentsimbi ezisisikwere eshushu liqengqiwe ngu 5-250mm, kwaye ukuba abandayo utsala isikwere sentsimbi yi 3-100mm.