With specially angled height tiles and springy trampoline tiles, The marble can now bounce Its way to tracks waiting on the other side. Including 2 trampoline tiles and 2 angled height tiles, This accessory must be combined with the GraviTrax starter set. What you get ' the GraviTrax trampoline comes with 4 pieces, including 2 trampoline action tiles and 2 angled height tiles. The perfect accessory for curious kids aged 8 and up looking to add some flair to their starter set.