Directly crush the decompression ball, relieve psychological pressure, adjust tension, and achieve the purpose of relaxation and self-treatment. Decompression ball is very suitable for busy life, it helps to calm the nerves. Squeeze it, stretch it, pinch it, rub it. This is a great sensory activity. In today's society, people at any level have different degrees of pressure. The new way to relieve stress is to vent toys, which seems boring. In fact, self-psychotherapy can be carried out in play. Ball toys to relieve stress and release tension. The classification of decompression balls has three directions. 1. It is designed to be repeatedly squeezed by hand for back pressure movement to speed up blood circulation. Similar to the hand trainer, according to sporting goods, the ball is classified as 9506.69. 2. According to the polyurethane material, it is classified as 3926 "Other plastic products" or the rubber material is 40 16 "Other vulcanized rubber products".