Review on Enhance Your Cycling Experience with RoadUp Presta Valve Core (10 Pack) and Removal Tool by Steven Saric

Buying these was the highlight of my Presta Valve training. I'm an old Schroeder Valve guy and had a terribly hard time battling Prestas on my new bike. It was a struggle to inflate the rear tire and found it was always flat after an hour. Anyway after watching some online videos I realized the valve core was bad and these cores were my saving grace. In five minutes I replaced both and now I'm a Presta converter.