The No. 1 is a definite step up from the CoC trainer gripper. I originally got the trainer because my forearms would tire out too soon on my back workout days, but now that isn't a problem. I could close the trainer quite easily, but the No. 1 is a whole other story. I could not close it all the way for the first couple of weeks. I've been surprised how quickly my grip strength has come along. It has been fun having them both around work and challenging the other guys to use them and for the price they are as solidly built as anything you will find.Get more detail about Captains of Crush Hand Grippers - 10 Strength Levels.
