PST HMS are slam balls designed for intense exercises involving dynamic throwing to the ground. The right choice of outer material and the sand inside ensure that the ball does not bounce. Slam training effectively 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 very durable and waterproof, allowing for outdoor training. The special casing that extends over the entire ball prevents it from slipping out of your hands, providing great comfort during workouts and increasing the precision of movements. In addition to slam training, the balls are also excellent for warm-up exercises and full-body strength training.