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This solid ball sand toy has many advantages. Its outer layer is made of soft PVC material, which is comfortable, skin-friendly, pleasant to the touch, and non-slip. The interior is filled with iron sand, ensuring even weight distribution. The ball can be inflated, allowing flexible adjustment of hardness and size, making it suitable for various training scenarios. Additionally, it is safe and durable, unlikely to cause injury, easy to maintain, and offers excellent value for money.