Alpaca dryer balls replace the toxic dryer sheets. Dryer sheets are laden with chemicals. Alpaca dryer balls are all natural, hypoallergenic, save money and cut down on dryer time. You can add your favorite essential oil for scent and extra benefits. We suggest using 3 balls in each load. They last for months, they are hand felted and will get a little harder and smaller, but still offer the same benefits.