Dynamax MINI 6lb Soft-Shell Medicine Ball Standard Black/Grey All Dynamax medicine balls are 14" in diameter, impact-absorbing, moisture and scuff resistant Soft-shelled with a heavy duty durable vinyl construction to ensure longevity of product life Ergonomic design maintains neutral spine increasing stability and max power Cored construction allows for use at max velocity without risk of injury Consistent design and manufacture ensures balls always remain balanced