Our wool dryer balls are made of 100% New Zealand wool and are a practical upgrade from standard dryer sheets. They improve the drying cycle by separating large clumps of wet clothing, which allows warm air to circulate evenly and shortens the time needed for the perfect dry. This saves energy, protects your clothing from unnecessary wear and eliminates static cling. Ultra-durable and long lasting, they never wear out and don't add any chemicals that are commonly found in standard dryer sheets. Each set contains four wool dryer balls in a handy 100% cotton carrying bag. What’s in it: four 100% New Zealand wool dryer balls, 100% cotton carrying bag. . What’s not in it: no plastics nor added chemicals of any kind, just 100% wool and cotton. It’s all good: This product saves gas and electricity and reduces waste and chemicals released into the air. Made in China.