According to google...

There is reflective stuff at 1sks.com...its actually black, but has reflective strands wrapped in.

Link to pics and review:
http://stormdrane.blogspot.com/2006/05/i-really-like-black-reflective.html

Link to 1sks store, search results for various lengths:
http://www.1sks.com/cgi-bin/sc/productsearch.cgi?storeid=*1287fdb585a30067864070