Rockin' Green dryer balls are the all natural alternative to plastic PVC dryer balls. Made with 100% wool they gently bounce in your dryer to keep your laundry soft while reducing the amount of time it takes to dry... saving you time and money and reducing your footprint on Mother Earth. Naturally pilling will occur. # Dryer balls may arrive smelling a bit sheepish, but this will completely go away once they are dry. # They reduce static A LITTLE but will not take static away completely.