Smart Sheep wool dryer balls shorten drying time, soften fabric, and reduce static. They help bed sheets stay untangled and are made of 100% premium New Zealand Wool. Smart Sheep dryer balls are all-natural, with no synthetic fibers or chemicals used. They will not unravel and will last for years. Wool dryer balls are quieter and more gentle on clothing than plastic dryer balls. Using dryer balls saves your dryer from residues left from chemical fabric softeners. Each pack can last for up to a thousand loads, meaning you won’t spend big money on dryer sheets or liquid fabric softeners.