These medicine balls are indestructible like no other medicine ball. They are made from the highest quality Dupont Kevlar brand fibers which makes them rip proof, tear proof. Wrecking balls feature a special texture surface that makes gripping them easy and will enhance your medicine ball workouts. These balls have limited bounce and their weight identifiers won't wear off the balls. Medicine balls are in high demand as a means of enhancing and varying workouts. They bring complete body workouts and drastically strengthen the core muscles and improve upper and lower back strength.