PST HMS are slam balls designed for intense exercises involving dynamic throwing to the ground. The right choice of outer material and sand inside ensure that the ball does not bounce. Slam training perfectly engages the entire motor skills, develops fitness, endurance, and promotes explosive strength. This type of training is effective in any sport that requires speed and high muscle power, making it an ideal option for martial artists. The ball is very durable and waterproof, allowing for training on the field. The special piping that extends across the entire ball prevents it from slipping out of your hands. This provides great comfort during training and increases the precision of movements. In addition to slam training, the balls are also excellent for warm-up exercises as well as full-body strength training.