Adjustable grippers of 25 setting from 10-100 lb Power Hand Grip - Deluxe, 3-spring variable tension (10 - 100 lb). Adjustable gripper of 15 settings from 5-150 lb Power Hand Grip - Pro, 5-spring variable tension (5 - 150 lb). Adjustable gripper of 10 settings from 5-50 lb Power Hand Grip - Adjustable, 1-spring variable tension (5 - 50 lb).