PVC weighted baseball training balls are composed of an environmentally friendly and non-toxic PVC shell and internal weighting materials. Their primary use is for baseball batting and throwing practice. Compared to traditional baseballs, these training balls are highly specialized as nearly every aspect can be customized: the color, thickness, and hardness of the PVC shell can be tailored, as can the type, weight, and volume of the internal filling material. Additionally, by using different sized molds, the diameter of the ball can be selected within a range of 4.7cm to 13cm. Therefore, these balls are suitable for almost all baseball enthusiasts and can meet a variety of different needs.