- Fun DIY physics toy- 16000mm rails included- Create yourself?rollercoster like rails with 360-degree flip overs，?steep drop and?climbs， sharp high-G turns， etc- Control speed， angle， timing by arranging your own railway- Steel space balls- Learn physics hands on!- Endless rail design possibilities- English and Chinese user's manuals included- Elevator powered by 4 x C-size / R14 batteries- Challenge level?3 (out of 5 levels in total)                                                                                                                                Dimensions: 0 in x 0 in x 0 in<br />Weight: 47.27 oz