Wool Dryer Balls – Bartlettyarns, Inc Bartlettyarns Wool Dryer Balls are a natural eco-friendly replacement for dryer sheets in your daily laundry. Each ball is made individually by hand consisting of approximately 2 ounces before felting. Approximate diameter after felting is 3.5″ – 4″. Re-usable. Reduces static and softens clothes. Non-Toxic and Fragrance Free!