... goose feather shuttlecock badminton 2. 3 layers cork head 3. Good durability precise fall point Specifications:1,Speed:75,76,77,78 ... ,79,2,Weight: 4.7g--5.2g, Badminton Shuttlecock 3,Appearance:A ... cork3.Feather material:A goose feather4.Fly:A5.Durability:A6.Speed:75~797.Weight:4.7~5.2g8.Use:international tounament9 ...