Your hand grip strength is the focal point that is critical to any sport or fitness training program. Think about it: If you can't hold on to the ball, your opponent, or the weights you are lifting, then how fit are you? Quite often, grip strength is simply overlooked because it is assumed it will improve automatically as you train. Sorry guys, but that simply is not the case. You have to work your grip just like every other muscle group. So get to it and pick up the grips that fit your needs. The Bone Crusher Advanced Package contains the following 200lb, 250lb, and 300lb. This package is great for the advanced grippers. If your grip is stronger than most and you like to bend metal this package is for you.