100% Wool dryer balls. Approximately 2.5" diameter. Excellent for reducing wrinkles and static! Wonderful to use for drying down products - helps to reduce clumping, and reduces drying time. 3 balls recommended for smaller loads, use 4+ in larger loads. NO chemicals, eco-friendly and safe for sensitive skin. Hand-made (locally in Milton, ON) for us by Hooked on Thursdays.