Yiri efere nchara na -eguzogide ọgwụ bụ ụdị efere pụrụ iche ejiri mee ya na mpaghara akwa. A na-ejikarị efere nchara na-eyikarị ka ọ bụrụ nke ọkpụrụkpụ nke oyi akwa na-eguzogide na-enwe ike siri ike yana ezigbo mgbochi na-eguzogide n'elu obere carbon carbon ma ọ bụ nchara alloy dị ala nke nwere ezigbo ike na plastik site n'ịdị elu. Ke adianade do, e nwere nkedo na-eguzogide na-eguzogide efere efere na alloy na-eyi uwe na-eguzogide ígwè.