IYAYA LED Badminton Shuttlecock Dark Night Glow Birdies Lighting For Outdoor & Indoor Sports Activities, 4-piece 4 x Color-changing LED Feather Shuttlecocks- Perfect for playing in the dark environment. LED lights installed in the back of the cork, with On/Off push button. Material: goose feather, feather, SMD lamps, electronic products. Cork ball head and each shuttlecock only weights about 6.7g/0.24oz. Economical shuttlecocks for beginners and amateurs.