Teaching children to become better swimmers needs to be safe and fun. The bright colours allows the balls to be seen clearly in the water. The 3 neoprene diving balls are completely filled with sand. The sewn-on tail stands upright on the under the water, therefore making it easy for the children to dive in and grab. The soft & non-slip neoprene material is comfortable to grip. The "soft" construction means it doesn't hurt when the ball hits your feet - unlike hard plastic scuba gear! The set is also an ideal gift for a child's birthday! Great playing and diving fun!