Laundry wool dryer balls do not contain synthetic fillers and are made of 100% wool. It is used up to 900-1000 times of drying. You do not need chemical softeners to soften your laundry in your dryers. It provides 25% savings in terms of drying time and energy costs. Your clothes will have fewer wrinkles and less static. It is shipped with 1 piece of 10 ml natural softening essential oil. It is handmade. Domestic Production.