These are only pair that have been too tight Just didnt work for me so I am returning. My first pair and I like them very much. The hardest part was spending the time to find just the right locations with enough brick edge, close enough to where I wanted my art, in places where the other clip would also have enough brick edge to grip. Not thick/tad heavy like you would see at Target. Looking beyond that, viewers could look at this story as one of overcoming adversity and not giving up on oneself. I have a Wahoo speed sensor and there is a significant variance between the speed measurements in Wahoo speed sensor and the speed measurement in the app (across the board for Zwift, Fulgaz and Rouvy). 5-9 I ordered an 8. By putting this unit on I was able to eliminate any back and forth motion, and any excess wear on my hitch parts. Overall I am glad I bought it.