- Fun DIY physics toy- 26000mm 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 4 (out of 5 levels in total)<br />- Fun DIY physics toy- 26000mm 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 4 (out of 5 levels in total)                                                                                                                                Dimensions: 0 in x 0 in x 0 in<br />Weight: 65.26 oz