- Fun DIY physics toy<br />- 5、000mm rails included<br />- Create yourself rollercoster like rails with 360-degree flip overs、 steep drop and climbs、 sharp high-G turns、 etc<br />- Control speed、 angle、 timing by arranging your own railway<br />- Steel space balls<br />- Learn physics hands on<br />- Endless rail design possibilities<br />- Elevator powered by 1*14G/R14 battery<br />- Total 14 piece set with English and Chinese user's manuals included<br />                                                                                                                                Dimensions: 0 in x 0 in x 0 in<br />Weight: 30.76 oz