The 3 Schildkrot neoprene diving balls are completely filled with sand. The sewn tail stays vertical at the bottom, under the water. Thus, the balls are very easy for children to catch and the soft and practical neoprene material is comfortable to grip. This gives children a successful diving experience and a lot of fun. The bright colors allow you to see the balls well in the water. Due to its "soft" construction, it doesnt hurt when the ball falls on your feet, unlike traditional hard plastic diving gear. The set is also perfect for a gift. A great game and diving fun! The German brand of more than 100 years, Schildkrot, is considered the inventor of the table tennis ball. In addition to table tennis, Schildkrot also offers a very extensive collection of Funsports and is considered the market leader in this field.