... .hypoallergenic ,no chemicals ,healthier4.reusable,ECO way to dry your fabricsMethod of Use1.simply place both dryer balls into dryer ... adjust drying time back by about 15%-25% from your usual setting and again the drying cycleSpecifications:spiky round pastic ... able to determine the optimal drying times that best suit your own needs,Drying time will vary depending upon dryer characteristics,fabric ...