Experience the power of gravity! Gravitrax is the all new stem track system from ravensburger! The gravitrax hammer will add some much needed velocity to your track layout. If the gravity spheres have slowed to a crawl this hammer will smack the sphere giving it some much needed momentum to complete the circuit! Use your imagination to build superb tracks and set the gravity spheres rolling! This stem system science, technology, engineering and maths is an ideal one to teach kids about gravity, magnetism, kinetic energy and fun. Hit a snag? Freestyle with your own track design or use the tasks and blueprints included to help you to get started in the world of gravitrax! Are the gravity spheres stopping or flying off before reaching the end target? Time for some problem solving. Rebuild and try something different! The gravitrax track system can be extended indefinitely with extra track packs and add ons each sold separately. The gravitrax hammer set is suitable for 1 or more players who are ages 8 years and up. Set includes 1x set of instructions, 1x hammer base, 1x long rail, 2x medium rails, 3x short rails. Height 4.8 cm width 19 cm length 19 cm