Baker Ross Make Your Own Solar System Kits with Various Sizes Polystyrene Balls, Foam Pieces &Wooden Sticks for Kids Science Projects (Pack of 2 kits) Budding astronomers will love to make their very own Solar System! Position the planets around the sun using the sticks and decorate with our acrylic paint. Each kit contains 10 assorted polystyrene planets, pre-cut foam pieces and wooden sticks. Instructions included. Planet sizes 0.4 - 3.9 inches. Age 6+.