It depends on the quality of the badminton bottom support. The rubber thickness of the red ball should be uniform and glued tightly. The cork diameter of the white towel should be 25 mm,
its shape
The shape should be round, the wood should be soft, and the amniotic membrane should be thin and firm. When choosing whether the ball rest has good elasticity, you can pinch it with your hand, or you can
put the ball in
Gently lift the racket up a few times.
To see whether the feathers are fastened, each shuttlecock requires 16 feathers. The best feathers are goose feathers. Because the goose quill tube is hard, straight and resistant to beating
Durable and drop speed is up to standard. The quality of chicken and duck feathers is not as good as that of goose feathers. The quill is thin and the wall is thin, and bending often occurs. pick feathers
When fur, the feathers are as white as possible (except those specially dyed). The feather length should be between 60 and 70 mm, and the length should be one
evenly spaced,
The feathers should be of the same thickness, and there should be no down hairs, broken stems, moth-eaten and other problems, otherwise the ball will not go the right way.
