About Eco Nuts Dryer Balls: Eco Nuts® Dryer Balls are a reusable, healthy, natural and chemical-free alternative to dryer sheets. Dryer Balls work by lifting and separating clothes allowing air to circulate, and can reduce drying time. They fluff and soften the laundry through gentle friction. These wool Dryer Balls are an alternative to the plastic PVC dryer balls. Place them in your dryer and as they tumble with your clothes they will keep laundry soft and reduce the drying time. They last for years. We recommend you start with 4 per dryer load and increase as needed. You can also use an essential oil to scent the balls before drying to scent your laundry.