Kenda Presta Valve Cores You may have all but eliminated flats on the rubber side, but we've all broken a valve core and had to walk it out! Or maybe you snapped the core tip on that fancy new latex tube. Be ready next time with a spare core or two, thanks to Kenda Presta Valve Cores. Next time you or a buddy break one when airing up or down, you'll be ready. Kenda Presta Valve Cores Specifications: Contents: 10-pack of valve cores (Presta) For: Mountain or road use Requires: Core remover tool | Kenda | Presta Valve Cores Bag of 10