A shuttlecock (also called a bird or birdie) is a high-drag projectile used in the sport of badminton. It has an open conical shape formed by feathers (or a synthetic alternative) embedded into a rounded cork (or rubber) base. The shuttlecock's shape makes it extremely aerodynamically stable. Regardless of initial orientation, it will turn to fly cork first, and remain in the cork-first orientation.
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A shuttlecock weighs around 4.75 to 5.50 g (0.168 to 0.194 oz). It has 16 feathers with each feather 70 mm (2.8 n) in length. The diameter of the cork is 25 to 28 mm (0.98 to 1.10 in) and the diameter of the circle that the feathers make is around 58 to 68 mm (2.3 to 2.7 in)
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