Meet your newest strength training partner, the Indestructible Balls™. Our Indestructible Balls™ are built to survive even the most challenging workouts. Made from a high strength proprietary fiber, Indestructible Balls™ are exactly what the name describes…Indestructible. Our proprietary material is in a class of its own when it comes to strength and durability. These fibers are used extensively in aerospace and military applications, for protective apparel such as ballistic-rated body armor and explosion resistant blankets. In addition to extreme strength, the Indestructible material also has excellent gripping characteristics to enhance holding, throwing, and slamming these balls.