The Hebi Hebi no Mi, Model: Mamba is a Zoan-type Devil Fruit that allows its user to turn into a black mamba hybrid and a full mamba at will. It can also give the user the ability to create and spit poison. It is called the Snake-Snake Fruit Mamba Model in the Viz Manga and the Snake-Snake Fruit: Model Mamba in the FUNimation subs. "Hebi" is Japanese for "snake". It orignially belonged to Simon's Great Grandfather and is known to be the rarest of the snake snake fruit that grow on the island he was born on in the Grand Line.