The Strubbel anti-stress ball helps improve concentration and manage stress at school or the office. With its friendly smile and tousled hair, the anti-stress ball has a cheerful appearance. The anti-stress ball is evenly kneaded. This promotes brain activity, allowing you to focus on what's important. It's also a wonderful way to let off steam, literally kneading away anger and frustration. The color of your anti-stress ball is randomly selected.