I have the medium and the heavier of the GripMaster units. I bought them for my 15 year old son who is thin as a rail. He started with the medium and has worked up to the heavy. The nice thing about these, is that you can work each finger seperately or together. His trigger control has improved, as has his groups. You can also work the forearm muscles, and wrist. I think it was money well spent, recieved them within a week of ordering them.
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