A Chaff Seed (, Kakuran no Hane (Chafu Shīdo)?, lit. "Feather of Disturbance") is a type of radio jamming device. They are thin sheets of metal about the size of the lead of a mechanical pencil with two thin wings, appearing like tiny helicopter rotors. They use a micro motor to float in the air using the structure of the seeds of plants in the Dipterocarpaceae family. They have the ability to float under their own power but can not withstand strong gusts of wind. They then jam electromagnetic signals and many of them are often used in unison to jam a large area.