I need to get some. I got bow hush in the past but want a different color. Is it just plain yarn or what?
Yup, I've used wool, and acrylic. Both seem to work as well as the other.
I have used alpaca wool yarn for recurve ends as well as bowstring silencer puff balls.
What BAK said, though ultimately I feel wool works the best since the fibers have more spring to them than synthetics.
The method of putting dense wool puffs at the string ends that Steve at Mountain Muffler is the most effective version of this idea I've used. Really like his strings on recurves.