[HIGH QUALITY] Built with goose feathers and using handmade lines. Each feather was firmly connected and then wrapped around the line twice for a secure connection. The feathers and threads are sutured with adhesive for staying power. [ONLY 6.7g WEIGHT] This LED Badminton is almost as light as the classical one which bring you the same sporting experience as before. The head is made of the high-performance cork, making the shuttlecock more flexible on the racket. [ONE-BUTTON ACTIVATION] With IC control, The LED lights can be switched on and off easily with the button placed in the back of the cork. [ECONOMICAL & PRACTICAL] LED shuttlecocks for beginners and amateurs.The funny activate for kids and adults to play badminton, especially in the night. [PACKAGE INCLUDED] 4 x LED Badminton Ball Feather Shuttlecock (Red, Green, Blue and Color Changing) Specifications Birdle Height: 3.5inch (8.9cm) Birdle Weight: 0.24oz (6.7g) Color:Blue/Green/Red/Color-changing