Plastic pepper balls are used in massage equipment and other health care products, the size is basically between 10mm and 25mm, and the material of plastic pepper balls is very demanding. Because the plastic pepper balls are in direct contact with human skin, the material of plastic pepper balls must be environmentally friendly and non-toxic. Generally, the massagers of plastic pepper balls are mainly massagers in foot bath boxes, which can slide with their feet, but cannot fall out. Therefore, only 2/5 of the massage plastic pepper balls are exposed to the outside and in contact with the feet, and the other 3/5 should be under the shaft sleeve. Moreover, it is necessary to ensure that the surface of the plastic pepper balls is smooth and comfortable when sliding, so the only material that can be selected is the POM plastic pepper balls in engineering plastics, and the commonly used one is Baoli M90-44, because Baoli's materials have good polishing effect, high surface brightness, environmental protection and safety.