Wire Constantan maka ịkwụgide ya bụ ọla kọpa-nickel na-agbanwekarị nke 55% ọla kọpa na 45% nickel. Njirimara isi ya bụ nguzogide ya nke na-adịgide adịgide karịa oke okpomọkụ. A na-akpọkwa alloy 294, Nico, MwS-294, Cuel, Cuel, Alloy 45, Cuni 44, CN49.