A shuttlecock (also called a birdie) is used to play Badminton. The shuttlecock is in the shape of a cone made from overlapping feathers which are embedded into a rounded cork base that is covered in thin leather. In order for the shuttlecock to rotate consistently, only the feathers from the left wing of a bird are used. The feathers were easy to damage and would need to be replaced throughout a game. Because of this, synthetic shuttlecocks have been developed which replace the feathers with a plastic skirt.