The Original Soft Medicine Ball! Dynamax standard medicine balls range from 4 lbs to 30 lbs. All balls are 14” in diameter, moisture resistant, and are made from 70% post-consumer recycled materials. The design and construction ensures that they will remain dimensionally stable and balanced. Our trade secret and craftsmanship guarantee that each ball, regardless of weight, has a friendly feel and will absorb high velocity impact, making for a fun and vigorous workout. The durable black and gray casings are another great feature, as they will help your equipment stand up to repeated use. Made in the USA. Dynamax delivers 25 years of research and development in every hand-made and superbly constructed product.