The Soft Dryer Balls help make your clothes dryer more efficient. These handy, soft rubber balls are about the size of a tennis ball. They have smooth, rubber tips that grip clothing while in dryer. The gentle grip lifts, separates and fluffs clothing better than drying alone. This means air circulates better during the drying cycle to help clothing dry quicker and more evenly. These blue dryer balls are safe to use with all dryer-safe fabrics. Each dryer ball is 2.5"" in diameter.