Shake , twist and bounce Sworld Earth-Blue to play with fluid dymanics. Combine science and fun for your children with this rheoscopic ball. 4 "Diameter
- Strong and resilient
- Rheoscopic- 'current showing"
- Watch billions of microscopic shimmering particles flow
- Unisex toy
- Avoid direct sunlight and heat
- For ages 6+
- Orders ship within 24 hours of purchase
- Free returns for shipping damage-see FAQS page
