Bamboo Dryer Balls ~Organic Bamboo, Activated Charcoal Infused Dryer Ball(One single Ball). Organic Carbonized Charcoal bamboo fiber. This bamboo gets its color from being carbonized and heated. It is not dyed. This bamboo has many benefits including reducing static, softening your laundry, and reducing drying time. An added benefit of negative ions & minerals that promote better health! My dryer balls are safe with whites, darks, delicates, clothes diapers, and really any laundry!