Brennan Kwrote a review of Q-Tubes 26in Presta Mountain Tube on September 11, 2016
Familiarity: I've put it through the wringer
These are definitely tubes. They hold air and do the job. I spaced it out and didn't look at the valve length and they were too short for my rims.... Takes a presta valve adapter to get them aired up, but it isn't the end of the world. Great tubes.