Wapometal is a special kind of metal discovered by Wapol when he was turning garbage into toys, manufactured via his Munch-Munch Fruit powers. It was this metal that turned him from a homeless bum into a very wealthy CEO of a toy company. His wapometal toys were so successful, the World Nobles granted him a new kingdom as a reward.
Franky used wapometal for his Iron Pirate General Franky. It is a shape-memory alloy that can be restored to its preconfigured shapes, being used to create merger modes in the components of the Iron Pirate General Franky.