Who invented stress balls?

Millions of women suffer from stress every day and easy stress management and control becoming really necessary.
Stress balls could be considered as easy effective stress relief method and stress balls could be recommended to many women – they could be used easily any time any anywhere (while on the phone, during meetings, while reading, during relaxation).
Stress balls are coming from Chinese culture during the Ming Dynasty. The earliest form of modern stress balls was small balls of iron made by a blacksmith in the town of Baoding – this is why in nowadays stress balls could be called "iron balls" in Boading, China.
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