GD GRIP Pro-70 Adjustable Hand Grip Strengthener (55 to 154 lb) You can adjust the resistance from 55lbs to 154lbs. All man can close the first stage, but not all can close the last stage. If you are pro athlete or just normal man or even you are little bit strong women, it doesnt matter. Because you can adjust the resistance of the gripper for your own strength! DO NOT BUY many other grippers. You can do your customized exercise according to your own strength with ONLY GD GRIP PRO-70. No noise or breakdown by using high-strength mold springs, thermoplastic nylon and steel. Lightweight, portable and noiseless, you can exercise anywhere. You can work out with GD GRIP PRO 70 wherever you can take your home, office, car, fitness club, library, etc. *GD GRIP PRO-70 is protected by PATENT issued by the US government (PATENT NO. US 6,881,177 B2).