What do badminton unilateral, hunchback, broadsword and the like mean?

Feather shape, one-sided hunchback, low price, poor stability and poor ability to resist flapping feathers.

Knife finger unilateral hunchback

Only the former goose can make a badminton goose-like ball.

Moreover, each feather is graded, and duck feathers can be better than goose feathers.

The broadsword is trimmed by hand, and the whole circle is naturally lightly trimmed. A broadsword is cheap, but a round one is expensive. Generally, the better the ball, the rounder or the better the design. There are many classifications ~ but only the whole circle is the professional entry level. The whole circle is very expensive, because it consumes materials, and feathers with very close shape and quality should be selected for splicing. Generally, the second broadsword can be made of some inferior feathers. It's a completely different texture.