Here I recommend one from MiniInTheBox Company, a professional company focus on this kind of product.
Brief Introduction of SpaceRail DIY Physics Space Ball Rollercoaster with Powered Elevator (5000mm Rail)
Key FeaturesFun DIY physics toy
- 5,000mm rails included
- Create yourself rollercoaster like rails with 360-degree flip over, 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
- Elevator powered by 1*14G/R14 battery
- Total 14 piece set with English and Chinese user's manuals included Specifications
- Dimensions (cm): 39.0 x 23.0 x 6.5
- Weight (kg): 0.843
... [Full description on MiniInTheBox]
Supplied by MiniInTheBox, Click Here to find the latest price.
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