Ravensburger 26815 GraviTrax Colour Swap Extension Ideal Accessory for Spectacular Marble Rails Construction Toy for Children from 8 Years

The GraviTrax extension colour swap is an ideal addition to the interactive marble run system3 colour swaps bring a new surprise moment to the GraviTrax world As if by magic the ball changes colour when it passes a stoneAll GraviTrax sets can be combined with each other for longlasting funThe construction toy provides indoor building fun for the whole family whether beginners or advanced users An ideal gift for children aged 8 and up with a GraviTrax starter setThe innovative marble run allows for free flexible construction and promotes creativity Children learn the laws of physics in a playful way