A dryer ball is a spherical laundry device for tumbling clothes dryers used as an alternative to fabric softener, reducing static electricity or softening clothing, or to accelerate the drying process.[1][2]
Wool or rubber dryer balls will help separate your clothes and get more air to them, cutting drying time. They can also reduce static so you don't need dryer sheets (see #7 below). The wool balls are said to absorb some moisture, further cutting drying time. We use these at my house and have seen a noticeable difference in the time it takes our clothes to dry.