What do you mean by hard wings?

Yuanbao wing kite. Hard-winged kite is an ingot-winged kite, which is the most distinctive and typical traditional kite in China. The styles of this kind of kites are changeable, and the skeleton structure varies with different themes, but there are unique lifts on both sides. It consists of two bamboo strips bent backward, a cuff line and a cover paper, forming a stable ventilation duct (wind bag) shaped like a wing, so it is called a hard-winged kite. Hard-winged kite's unique lift sheet design makes it have the characteristics of good takeoff performance, stable flight performance and easy ascent, which is well received by kite lovers. At the same time, the structural flexibility of the hard-wing kite makes it popular with literati and painters. Kite combines China's meticulous painting and kite making technology, which has unique aesthetic value and collection value. Weifang "City School" meticulous figure kite is a representative work of handicraft kite.