PST HMS are slam balls designed for intense exercises involving dynamic throws to the ground. The right choice of outer material and the sand inside ensure that the ball does not bounce. Slam training perfectly engages the entire motor skills, develops fitness and endurance, and promotes explosive strength. This type of training proves beneficial in any sport that requires speed and high muscle power, making it an ideal choice for martial artists. The ball is highly durable and waterproof, allowing for outdoor training. The special casing 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 exercises.