With its rapid spin and precise flight, the TruFlight 4000 (TF4000) is an all around excellent performer, whether playing delicate shots at the net, or smashing with full force. Black Knight TruFlight 4000 (TF4000) comes in neon yellow skirt for better visibility for indoor and outdoor. The shuttlecock has good durability for long lasting play. Comes in a pack of 6.