The ultimate momentum propeller! The Li-Ning Bolt Gold has been built using the highest quality natural cork as the base with a superior PVC cover on it, and a top-grade aerodynamic nylon skirt. This gem of a shuttlecock is crafted to replicate the flight, sound, and play of their feathered counterparts using a feather shuttle as a baseline and engineered to provide you with maximum durability and unmatched performance.