GraviTrax 4th Generation Add on: Create the element of surprise with Bridge track sections! Bypass large gaps with Bridges. Combine the Bridges with your GraviTrax Starter-Set for even more variety by interlinking track sections for really spectacular results. Experience the power of gravity! GraviTrax is the all new STEM track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! Create the element of surprise! Bridge track sections! How many unique track designs will you create? 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-on’s – each sold separately This set is suitable for 1+ players ages 8 years and up This Bridges Expansion Set includes 3x Adjustable Length Bridges 2x Long Thin Rails 2x Long Slow Rails 1x Long Rail 2x Medium Rails 3x Short Rails 1x Set of Instructions Age: 8 - 99 Product Dimensions: 34 x 34 x 6 cm