FEATHER : SELECTED 1ST CLASS GOOSE FEATHER HERD: IMPORTED CORK JET-50 PROFESSIONAL COMPETITION FEATHER : SELECTED 1ST CLASS GOOSE FEATHERHEAD : IMPORTED CORKWEIGHT : 4.7-5.2gSPEED : 75 ,76,77,78,79,80PACKING :1DOZEN/TUBE, 50DOZEN / CTNREMARK1.ALL FEATHER SORTED OUT BY FEATHER-PICK-MACHINE TO KEEP 16PCS FEATHER OF ONE SHUTTLECOCK IN SAME CURVATURE ,MAKE THE THUTTLECOCK STABLE FLYING ,ACCURATE DROP ...