Experience the thrill of building and playing with the Gravitrax Catapult Expansion Pack from Ravensburger. This box contains all the necessary parts to expand your marble run track and explore the fascinating world of Gravity Marbles. The set is compatible with the Gravitrax brand and features a range of fun features that will keep you entertained for hours. Made from high-quality plastic, this builder set is perfect for children aged 8 and above who love STEM toys. Get ready to embark on an exciting journey through the universe with the Gravitrax Catapult Expansion Pack.