Review on CALPALMY AR-PRO 28 700x20-25C Road Bike Replacement Inner Tubes Presta Valve 42mm for 700c x 20, 23, 25 Tires (6 Inner Tubes + 2 Tire Levers) by Justin Ferguson

I bought these tubes because I needed more than two - there are plates! My expectations were low, but this is a tube - if it holds air and the seams don't unravel, then you're good. I haven't had any problems with tubes. Many people don't take the time or care to properly mount the tubes to the rim. I always use baby powder to keep the rubbers from sticking together and the tube from folding in the tire. In general these lamps (although not of the same quality as the Continental) were fine. No problems so far, over 350 km on it.