The Agitator Balls by Esembly pack a punch in the washing machine and dryer. As your washer spins, the Agitators pound into the fabric, forcing soil and stains to the surface, making it easy for the Washing Powder to carry them away. In the dryer, Agitators lift and separate the fabric allowing hot air to flow more efficiently, helping dry your laundry quickly. The bumps and spikes on the balls massage the fabric so it comes out softer and fluffier. Agitators are made from enviornmentally-friendly silicone and come 4 balls per pack.