I have used all types of grips, everlast, harbinger, no name brands, and even HG(Heavy Grips), and these are by far the best. I used the HG first level and I could easily do it fifty times. However, w/ the #1, marked at 140lbs I believe, i had trouble doing it once. After two weeks I can close it ten times. ( I needed to start grip strength again.)I still have a ways to go to get to the level 2.would recommend this product for anyone looking to increase strength. Its impressive to someone who thinks they are, or may be much stronger, but can't close one of these when you can.I would recommend starting w/ the trainer grip.