Its made of a braided material. Most likely dacron. I am sure Chris Stewart (Tenkara Bum) will have an more exact answer.

As far as Tenkara goes, I just bought my first kit. I've been fly fishing a very, very long time, and was a bit hesitant. But after reading about it, I decided to give it a go. Although in not any particular order of importance, here are some excellent links for you to explore.

http://www.tenkarabum.com/

http://www.tenkaratalk.com/

http://tetontenkara.blogspot.com/

http://castingaround.anthonynaples.com/

http://threeriverstenkara.com/

http://www.tenkarausa.com/

I have fished a couple of bluegill ponds and will be taking my Tenkara outfit with me to CO.

Dave