I don't have the CoC grippers but I have the Heavy Grips.
I just recently closed the gripper #5 - 300 lbs of pressure per square inch.
I still have the #6 - 350 - that's the one that Magnus closes 2 times - yes, world's strongest man
I have retarded strength in my hands....I don't have amazing grip when lifting, it's decent but nothing awesome, but I have a crushing grip and I break most peoples' hands if i press hard enough and yes they do help
Here's a link for you:
Heavy Grip Handgrippers- Hand Grippers, grippers, handgripper, wrist, strength
I just recently closed the gripper #5 - 300 lbs of pressure per square inch.
I still have the #6 - 350 - that's the one that Magnus closes 2 times - yes, world's strongest man
I have retarded strength in my hands....I don't have amazing grip when lifting, it's decent but nothing awesome, but I have a crushing grip and I break most peoples' hands if i press hard enough and yes they do help
Here's a link for you:
Heavy Grip Handgrippers- Hand Grippers, grippers, handgripper, wrist, strength