These are caps of the more popular “auto catching” accessories to Pokemon Go. Specifically, these caps will fit the Megacom Catchmon X (CMX), the Megacom Duomon (DM), and the Niantic Pokemon Go Plus Plus (PPP). While providing ‘swag factor’ ad showing off your team, house divided, or lack of team (Harmony), it also helps to keep the batteries from popping out, and provides a nice partial dust/water covering for one side.