I have mentioned before that grip is quite often the limiting factor in performance. Whether it is limiting your 1 rep max deadlift, or killing your ability stay on the bar for the last 5 pull-ups, if your grip is weak, you are not performing at your maximum potential. The 3 inch powder coated cannon balls can be attcached to a pull up bar and used for pull-ups, attached to a bar for deadlifts, or attached to almost any other object you can think of to eliminate grip weakness as your achilles heal. Just think of how much more challenging kettlebell farmers walks can be when you are gripping the weight with 3 inch spheres.