Features: 12PCS durable black goose feather shuttlecocks. Enables fast volleys and ensures flight consistency. Using good-quality goose feathers with a durable cork head. Ideal for practice and casual playing. Specifications: Quantity: 12 Speed Rating: 77 Material: Goose Feather Color: Black Weight: Approx. 5g Package size: 39 x 6.5cm Package weight: 200g Package List: 12 * Shuttlecock