Made of heavy-duty wooden base or high-quality MDF board. Smooth, polished finish for classroom demonstration. Sturdy and durable design suitable for repeated use. Approx. 75 cm × 10 cm (Length × Width) (Dimensions may vary depending on model.)Specially designed curved / deceptive plane alignment creates an optical illusion. When a small ball is placed on one end, it appears to roll upward, giving the effect of anti-gravity.

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