Han-Xiongnu Bow by AF Archery 

This Niya bow shape is based on the ancient han dynasty bows used in Northestern China. Such bow shapes were common as military bows and crossbow prods. Variety of ethnic groups used this bow such as xianbei, xiongnu, sogdian, Persians, Han, etc. However, the m shape bow is as early as 4000 years ago from Bronze Age China.
The Chinese fiberglass reproduction is called New Han Bow by AF Archery
afarchery.com/...
"Han to Jin (3rd Century BC to 5th Century AD) Excavated from Tomb No. 30 at Yingpan, Yuli County in 1995.) In the collection of the Archaeology Institute of Xinjiang Uygur Autonomous Region." Two bows were featured in the exhibition. Both dated from the late Han/Jin period (about 200-300AD). One of the bows, although probably very interesting, had not been removed from its quiver, so there was no way to examine it. The other, however, was out of its quiver and so well preserved that the original gut string was still in position, although the limbs have been warped.
Bow: Length: 130 cm. Width: 0.6 cm - 3.2 cm. Thickness: 0.6 cm - 4.6 cm. Arrow: Length: 73.5 cm.