Bought two identical straps, they have slightly different diameters. I wouldn't care but my elbow size is on the border between two sizes, I went with the smaller of the two to be on the safe side. A strap fits snugly in each of my hands and I really like it. The others aren't as comfortable on any arm, and it seems to me that they don't do anything for me. I measured them to be 3/8 inch (circumference) apart which seems to be a critical difference.
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