I used this to make my own dryer balls.  You need to use pure wool, and just roll it up and wash it in hot water a few times to 'felt' it.  Why pay someone else $15 bucks to do this, when you can buy a skein of wool, give the cats a few hours of fun, and roll your own?  This color is dark, but I've had zero issues with the color bleeding onto the clothes in the dryer, all though I did use them just on dark loads the first few times.  I usually add a few drops of essential oils to the balls before each load, it imparts a wonderful light scent to my finished laundry.