If you're trying to save money on single-use dryer sheets, make more eco-friendly choices, or simply prevent your sheets from balling up in the dryer, investing in some dryer balls is the way to go. These spheres, usually about the size of a tennis ball or baseball, tumble around with your clothing in the dryer, ensuring that hot air gets where it needs to go. The result is fewer wrinkles, decreased drying times, and completely moisture-free, refreshed clothing.