Composition: goose feathers, feathers, SMD lamps, electronic products; does not contain any fluorescent material, 100% safe, you are sure to use it.Dual Purpose Product: This LED badminton shuttlecock is perfect for playing at night and makes the game even more fun. It is also a fun option for amateurs and beginners during the day.Economical and practical. Economical shuttlecocks for beginners and amateurs. Kids and adults can have fun playing badminton after dark.Lightweight: Each shuttlecock weighs just 6.9g for excellent bounce and ease of handling.