With them, children can DIY the solar system. Made of material, they are high-quality and. 4 x Sun Balls 4 x Saturn Balls 4 x 10cm Balls 4 x 7cm Balls 4 x 5cm Balls 8 x 3.5cm Balls 12 x 3cm Balls. - There are 4 sets of solar system balls, each set has 10 balls.