4 Carlton Sportcraft Badminton shuttlecocks in a tube. Shuttlecocks are also known as birds or birdies due to the use of feathers for the skirt. In this instance the shuttlecock is made up of a nylon skirt with cone shape. The top is rubber. The dimensions listed are for the individual shuttlecock. They were made in England by Carlton Sports Co Ltd for General Sportcraft Co Ltd, Bergenfield, New Jersey.