Very interesting bows. I have studied them quite a bit. Most info thus far has been pretty accurate, they are called "yumi" longbows. They were used almost exclusively in Japan. The earlier types were constructed out of hardwoods like maple and mulberry, same as regular selfbows. They actually became longer over the course of time that they were in use. They are built highly reflexed, and over the years when lamination techniques were perfected, they were built out of composite materials, hardwood, bamboo, animal glue, ect'. Towards the end of their era of use they were made out of bamboo only. And as seen in the pic' above, they were asymetrical with the top limb longer than the bottom limb. Hope this helps. Arrows were almost always made of bamboo. They were very long, and were drawn significantly farther than the average draw today, often several inches pat the ear.