The Simple Goods Dryer Balls are made from 100% pure New Zealand wool and are a great natural and sustainable alternative to fabric softener. The Dryer Balls reduce drying time in the tumble dryer by up to 30%. They are anti-static and reduce creasing in clothes. Can be reused up to 1000 times. Add a few sprays of the Simple Goods Laundry Tonic directly to the Dryer Balls for a wonderful and subtle scent.