Dryer balls are designed for combined use: to separate garments during the drying phase and to retain heat, transferring it to the garments and speeding up drying. They reduce drying time by up to 25%. There is no need to use liquid softening wipes or softeners during washing. They can be used an unlimited number of times. BucatoSoft balls have been scientifically tested by an independent tissue testing laboratory to verify their compliance with ISO standards. 2 pieces per pack.