The main body is entirely made of metal (alloy). When you hold it between your thumb and index finger and spin it with force, it deforms as shown in the photo and continues to spin. Bearings are incorporated into the rotating part, and once it starts spinning, it continues to spin. The mechanism of deformation is as follows: before spinning, the wings are all held closed and fixed by neodymium magnets, but when spun with a certain amount of force or more, they open due to centrifugal force. We would appreciate it if you could consider it after viewing the photos.