Stress-Relief Inflatable Rainbow Ball - 2 PcsProduct Description Transformative air ball: this expandable breathing ball can be transformed from a small ball into a large ball by simply twisting. You can easily reduce it by reversing the movement. It is a simple and lightweight toy that provides hours of entertainment. Guaranteed safety: relieve stress and relax with carefree breath, because our expandable breathing ball made of environmentally friendly ABS ensures safe use. Its reusability