Locally handmade dryer balls are a wholesome, natural, chemical free alternative to mass produced dryer sheets. The core is made from felted raw wool fiber sourced from Wisconsin which is then wrapped with wool yarn and felted a second time. Wool wicks moisture away so not only do you have the benefit of a reusable earth friendly product but you can also enjoy a slightly reduced drying time, reduced wrinkles, reduced static cling all while saving you money! This product is reusable and is guaranteed for one year although most people happily report using the product for at least two years. Pilling and a slight amount of shrinking may occur but does not change the effectiveness.