Set of 4 Tru Earth 100% Premium Organic New Zealand Wool Dryer Balls (no fillers). Softens Laundry Naturally - Made with 100% sheep wool. Shortens Drying Time - (use 3-4 balls for small/med load, 5-6 for large). Saves energy by absorbing moisture and reducing drying time. Extra-Large (larger than a tennis ball), Eco-friendly, Handmade. Replaces Dryer Sheets & Liquid Fabric Softeners, Saves Money. (An eco-friendly, petroleum-free alternative to plastic dryer steamer balls). Wool dryer balls help improve air flow in the dryer while absorbing moisture. This shortens drying time resulting in less energy used and a reduced power bill. Each premium dry ball can be reused for more than 1000 loads and help extend the life of your clothing. Prevents static cling. All-natural and hypoallergenic with no fillers, chemicals or synthetics. Perfect for babies or other family members with sensitive skin or allergies.