The Kai Kai no Mi (Demolition Demolition Fruit) is a Paramecia Type and is known as one of the most destructive. It was consumed by a Rear Admiral by the name of Kogino. It gives the user the ability to cause an explosion on contact. This ability almost destroyed an island until someone hit the user. It has shown no limit on the stuff it can destroy, even Kogino said he destroyed an entire country. Once something explodes, there are no remains. He can also turn it of whenever.
In terms of design, it is blue with yellow dots. It has a brown stem.