Sold: 12 Count badminton shuttlecocks, color is black; Material: Advanced Black Goose Feather,Solid Cork Head; 100% infrared selection of goose feathers quality, feather hair straight and thick, good strength, enhance the badminton resistance; 100% test badminton rotation, to ensure that the badminton flight stability; Goose feathers are treated with special formula, smooth and soft; Badminton ball head: resistant to beating, good elasticity,accurate placement. High quality cotton thread:Use high quality cotton thread,Automatic hook line machine hook line,coil is dense and sturdy. The same spacing:Feather neatly arranged,angle uniformity,spacing is consistent，the use of more stable speed. Feather pole is stout:Featured rough shag hair pieces, the same length, greatly enhance the ball resistance and stability. Black goose feather:High quality goose feather, high density, uniform sha, not only beautiful, but also more stable,more resistant to fight.