Approximately 3" diameter, hand made here in Massachusetts with 100% wool from our farm in Charlton, MA.  These dryer balls are great for absorbing moisture in your laundry to reduce drying time and to prevent static.  They last years, the more of them you use the more savings on your dryer electric bill you enjoy. There are 5 dryer balls for $40 including free shipping. 
 
They also make excellent Dog and Cat Toys, even for large dogs they hold up for years and don't pull apart.