Sweet Gumballs are made with 100% wool to the core. They are an excellent alternative to dryer sheets, fabric softener, and plastic PVC balls. They are 2.5-3 oz in weight. The most effective dryer balls are measured by weight, not circumference, so each dryer ball varies slightly in size. They are felted 4 times by an exceptional process to ensure that they are well-felted and will not unravel.