Instructions (language-neutral/international), 2 base plates, 2 Bernoulli rails, 1 O-plastic rail high, 1 O-plastic rail low, 2 FlexTubes, 2 funnels, 8 base stones, inserts for the base stones: 4 tunnel curves, 2 straight tunnels, 2 tunnel turnouts This expansion focuses on the speed of the balls; some elements help with speed control, others speed up the balls. GraviTrax is the flexibly expandable and interactive marble run system for children aged 8 and over; with GraviTrax, entire marble run worlds can be created; all GraviTrax products in the three lines GraviTrax, GraviTrax PRO and GraviTrax POWER can be combined with each other; an ideal gift not only for birthday for boys and girls. Combined with any GraviTrax starter set, the extension tunnel brings even more variety and ball fun to the GraviTrax universe; how much longer can the ball roll with the new elements? GraviTrax Core unleashes the inventive spirit and offers endless possibilities beyond imagination; the versatile elements allow a playful introduction to the GraviTrax universe and offer plenty of space for creativity and free building; everyone can get started right away and create extraordinary tracks!, Éditeur: Ravensburger Verlag