iSuperb Solid Colorful Laundry Ball Washing Ball, Set of 6 (type 2) The ball is solid, 6 pack, 2.4 inch (6 cm) across, around 40 grams Environment friendly. Lack of chemicals which may harm the environment Improve washing greatly by scrubbing clothes, save water and energy Help out with getting out dirt and stains, and perfect to use them on denim, cotton, and other sturdy fabrics--nothing too delicate Separate the clothes for a more efficient process, and they work great for the task, 6-10 balls are ideal for a wash weighing around 5 kilograms