Anti-stress silicone ball 5.5cm: • Safe Material: The stress ball is made of eco-friendly TPR, wrapped in silicone material, soft and elastic material, eco-friendly raw materials, non-toxic and harmless. • Strong adhesion: you can launch this 5.5cm silicone anti-stress ball: • Safe Material: The stress ball is made of eco-friendly TPR, wrapped in silicone material, soft and elastic material, eco-friendly raw materials, non-toxic and harmless. • Strong adhesion: you can cast this Material: Silicone; Green color;