this is copies from the AMA rule book

http://www.modelaircraft.org/files/events/rulebooks/CLCombat.pdf

4. Streamers. Streamers shall be supplied by the contest management. Streamers shall be made of crepe paper sheets or other suitable material such as plastic, be of uniform length using two distinct colors, and shall be cut two (2) inches wide and up to ten feet long. The streamer material should then be doubled and the folded lengthwise for two inches before being double tied with the string leader. The string leader shall be 16- to 20-pound test, shall be marked 84 inches from the knot, and shall extend beyond the ink mark 18 inches.

We use plastic table cloth from Walmart cut to width. Crepe paper has pretty much disappeared because of Nelsons.