The hardness is 60-80 degrees.
1. Most of the existing mahjongs are made of ABS material. Since the ABS material is relatively hard, it will make a loud and crisp sound when it collides with each other or with hard objects. Playing mahjong seriously affects the work, study and life of neighbors.
2. In order to overcome this shortcoming, many people have improved the structure of mahjong. In the published Chinese patent documents, most of the technologies now have soft rubber or soft rubber added to the edges of the mahjong. Plastic can reduce the sound of mahjong collision.