ʻO ka hui ʻana o ke kāne a me ka wahine malleable cast iron (Flat / taper seat) he mea hiki ke wehe ʻia me nā pilina pili kāne a wahine.He huelo a he ʻāpana kāne paha, he poʻo a he ʻāpana wahine paha, a me kahi nut union, me ka noho palahalaha a i ʻole ka noho liʻiliʻi.