Michelin's Airstop name says it all. Their Airstop tubes use a proprietary butyl rubber that holds pressure longer so you won't have to top off your tires so much. These fine tubes are reinforced at the valve, too.
Size: 700 x 18-23c
Weight: 93 grams
|700 x 18-23c||086699103574||10357||MIC43721195C|
|700 x 25-32c||086699502957||50295||MIC423053142|