4pk Eco Wool Dryer Balls. Reduces drying time. Reusable. Eco-friendly. Stain-free. Up to 500 washes! A healthy, chemical-free alternative to dryer sheets and PVC dryer balls. 100% wool. Each wool ball is made of 100% natural wool that gently tumbles and whisps against clothing and linens to soften. When added to a load, each ball is design to reduce wrinkles, fluff and smooth out clothing to make it comfortable for wear. Add any desired essential oil for a scent boost! They are eco-friendly with no harmful fillers, chemicals, and fragrances. Perfect alternative for sensitive skin. Replace fabric softener and disposable dryer sheets with multi-use, eco-friendly and money-saving dryer balls. Dryer balls are energy saving and decrease drying time. Allows greater airflow and heat circulation. To refresh, place wool dryer balls in a thin sock. Run through a hot wash with any standard detergent. Heat dry and dryer balls are fresh and ready for the next load. 4 pack