LED Badminton Feather Shuttlecock Dark Night Glow Birdies Lighting for Outdoor & Indoor Sports Activities, 4-piece Size: 80 mm x 60 mm (3.1 * 2.4 inch) Material: goose feather, feather, SMD lamps, Electronic products LED lights installed in the back of the cork, with On/Off push button Good durability and excellent performance Wonderful and fun experience to play badminton at night