With the IronMind IMTUG Two-Finger Utility Hand Gripper, you can target your training and focus on one or two fingers at a time - even your thumb! Made in the USA with precision manufacturing for world-class performance, feel and appearance. Using the utility gripper is a great, portable way to train your thumb. It features ergonomic handles for reduced pressure on your hands. Can't quite put away a CoC No. 2? Hit your pinkie and ring fingers with an IMTUG3 or IMTUG4 and see what happens. Want to certify on the CoC No. 3 or beyond? Meet IMTUG5, IMTUG6, and IMTUG7. Want a portable way to train your pinch grip? IMTUG1, IMTUG2, or IMTUG3 should be in your pocket. Pinch or crush one or two fingers at a time. Proprietary GR8 springs in 7 strengths: precise, durable, good-looking. CoC Compatible: Works hand-in-glove with Captains of Crush Grippers. Choose the IMTUG based on the relative strength of your fingers: Thumb - weakest - use an easier IMTUG. Ring and pinkie fingers - moderate - use a medium IMTUG. Index and middle fingers - strongest - use a tougher IMTUG. Which IMTUGs should you choose? Use the following guide to select the right level of IMTUGs based on which Captains of Crush Gripper you are training with: Guide or Sport - IMTUG1, IMTUG2. Trainer or No. 1 - IMTUG2, IMTUG3, IMTUG4. No. 1 or No. 2 - IMTUG3, IMTUG4, IMTUG5. No. 2 or No. 3 - IMTUG4, IMTUG5, IMTUG6. No. 3 or No. 4 - IMTUG5, IMTUG6, IMTUG 7.