Contents: 4 pieces Material: 100% natural wool (biodegradable) Size: diameter 7 cm Features: Make your clothes softer, remove static electricity, reduce drying time in the tumble dryer by up to 40%, save valuable energy Io Nova dryer balls are the smartest, most cost-effective and environmentally friendly alternative to plastic dryer balls and fabric softener. The dryer balls reduce drying time in the tumble dryer by up to 40% and ensure that your laundry is smoother. This saves valuable energy every time you dry your laundry and allows you to dry your laundry much faster and more comfortably. The balls swirl around in the machine and loosen your clothes in this way. By using the dryer balls, the air in the dryer can circulate better, which results in a smoothing of the fabric fibers of a wide variety of garments.