The MMX ™ shell is soft as beanbags providing extraordinary smooth feel in your hands. The ball always keeps its perfect round shape in the air but doesn't roll on the floor when dropped. The MMX ™ is durable and easily washable with water and any kind of soap. You can juggle under the rain or drop them on wet floors but sinking the balls underwater is not recommended since the plugs are not glued. Filled with millet seeds injected with a special machine through a very small hole allowing us to use a pretty much “invisible plug” .