Slam ball comes in black with the weight markings on the top side. slammer ball easy grip and weight labeled for easy identification, these are ideal additions to your routine. Fitness equipment morphs really quickly, but a number of the best equipment choices have been around for a long time and continue to remain the top choices for professional trainers. you can use the Rubber slam ball/medicine ball for various exercises including throws, sit ups, lunges, push-ups, slams, squats, weight lift, workout, crossfit, fitness, gym training, MMA training, Boxing training, and much more. slammer ball are offered different weights. diameter balls are 2kg, 3kg, 4kg, 5kg, 6kg, 7kg, 8kg, 9kg, 10kg, 12kg, 15kg, 18kg, and 20kg. the sizes being approx 9'' diameter ball. slammer ball is made of a thick PVC rubber core with a mixture of sand and air inside the core and ball outside of the core has a non-slip rigid.