Wool dryer balls for laundry naturally soften clothes and reduce static cling. We live on a sheep farm in southwestern Pennsylvania. I discovered how well wool yarn balls worked in my dryer and decided to figure out a way to make them last 8-10 years using freshly sheared wool right from the sheep. Our extra large Woollow dryer balls are a whooping 9" around, in their circumference, 3" in diameter! They are solid wool all the way to the center. No more chemical-laden dryer sheets needed. These dryer balls soften clothes, reduce time to dry clothes by about 20%, so they save on electricity too. They also reduce static cling. No care required, just leave them in your dryer. Each dryer ball is $7.00. Great gift for birthday, baby or wedding shower, Christmas gift! If you order 3 or more dryer balls, you get a muslin storage bag free!