Each lovingly handmade wool ball has a real stone center so they have some weight and heft. Wool dryer balls are an inexpensive and reusable and eco-friendly solution to chemical laden fabric softener and dryer sheets. Not only for people who have sensitive skin, dryer balls also absorb static and separate your laundry to allow the hot air in, which reduces drying time! That saves YOU time and money!!! Add your dryer balls with your wet clothes when you put them in the dryer and they will gently soften your clothes and fluff bulky items like towels and blankets. Plus, they last for years! These wool balls are hand-wound and tightly felted so they will NOT unravel in your laundry! They weigh approximately 2.5 oz each and are 8-9 inches in circumference. Random patterns.