The Sweater Stone is a unique American-made product that removes pilling and balling from your sweaters and will renew the look and luster of garments. It is made in the USA of natural materials and recycled packaging. The sweater stone is for use on heavy fabrics such as upholstery, woolen sweaters, sweatshirt fabrics, etc. It is not recommended for use on fine knit or more delicate fabrics. Be sure to test on a corner of your fabric. For more than 30 years, Sweater Stone has and continues to employ the functionally disabled in their workshop.