Zabuza's signature weapon was the Kubikiribocho, an oversized broadsword, whose shape was thought to decapitate enemies. This large weapon has the unique ability to absorb and use the iron from all the blood it sheds, from whoever it cuts, in order to reform itself if damaged or broken. Zabuza was a master in its use, being capable of dispatching numerous enemies with a few slashes, and claiming that his sword "never cut a second time", implying to have killed a large number of people with a single attack.
-- From Wikipedia.
Miniature replica Momochi Zabuza sword from the anime series Naruto. 93 cm. Carbon steel blade. Comes with nylon sheath with straps. 2.3kg.