We both started climbing at the same time, and I noticed after half a year that his handgrip endurance was a lot better than mine. On is medium (red) and the other is heavy (black). Please make sure that you are posting in the form of a question. It is small, convenient to carry around, durable, and seems to be put together well and that's the only reason why I didn't give it one star. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Was the information on this page helpful. I bought 2 x Grip Master Pro Edition Heavy Tension Hand and Finger Exercisers - Orange, 13 lb to try and build up my strength with some exercising every month as this was the toughest product that was on the Physic Room website. There is absolutely no resistance to work out any muscles in the hand or fingers and I can't understand why it has gotten such a good rating. I bought the blue light tension version which is perfect for me. "Gripmaster is the only hand exercise that isolates and challenged each finger individually. -. There was an error retrieving your Wish Lists. It is built well and holding up so far. It looks to be the same design as the others. I asked if/how he trained grip, and he recommended the Gripmaster Black. FOR SALE! I pretty much type all day, but do a lot of high dexterity physical work on the weekends/nights (ie working on cars, soldering, building whatever, climbing, hiking, etc).