ITEMporia&reg; Multicolor LED Badminton Shuttlecock W Auto On & Off Feature - Dark Night Glow Birdies Lighting For Outdoor & Indoor Sports Activities, Set of 6 COLORFUL - 6 x LED Feather Multi-colored Shuttlecocks (Color constantly changing), Perfect for playing in the dark environment. AUTO ON & OFF - LED lights installed in the back of the cork, with built in vibration sensor, light up when players start playing and will go off if left inactive. PREMIUM MATERIAL - goose feather, feather, SMD lamps, electronic products. PERFECT WEIGHT - Cork ball head and each shuttlecock only weights about 6.7g/0.24oz. 100% SATISFACTION GUARANTEED - Economical shuttlecocks for beginners and amateurs.