In the dark:
Each badminton has a hole for a RECORDING bend light.
I could not test it but only a shuttlecock down rum transparent.
The see-through will probably be best suited for the way it is in the description.
Unfortunately, no test chemical light is, this one must separate purchase. But allegedly also shake
more cost-effective from the fishing shop (badminton to test the size of carry).
Wind Ring:
It is a so-called draft shield. He is slipped over the shuttlecock. This makes it slightly heavier and flies better in windy conditions.
I have tested the wind ring times with a normal spring ball, thereby it is a bit heavier and also flies faster.
The flight characteristics of normal shuttlecocks can be improved with the wind very ring.