Dryer balls are a chemical-free, environmentally friendly method of eliminating static from your clothes. Hand made using fleece from our alpaca herd. No perfumed scents, colors, dyes or chemicals added. Toss them in your dryer and forget about them. They never need washing or "airing out". Each ball is approximately the size of a tennis ball. A minimum of three balls are recommneded for a full load of clothes.