... 2.it is best for training 3.inrease the athelets vision and reaction Professional training badminton shuttlcock Black&White No. ... this badminton shuttlecock:goose feather.Flying:AB. Function:keep training with black&white series shuttlecocks in 2-3 months, ... . About us FLEXPRO products are exported to the United States, Canada, Korea, Singapore, Thailand, Malaysia, Indonesia, and Vietnam. Brand ...