Michelin has been in the tire and tube business for over 140 years, which means that over time, they've had lots of opportunities to perfect their basic offerings, like the Airstop Bicycle Tubes. Made from a premium butyl rubber, these reliable tubes come in just about every size you could need to get your bike back on the road or trail. The butyl rubber ensures a long last hold on the air inside the tube and tire, and helps to resist some punctures with its flexibility, and that it will not get more brittle as time and miles go on. Available in Presta or Schrader valve types, you can make sure that you get the proper valve that fits your rims and your pump best, allowing for ease of use. The valves come in a variety of lengths as well, ensuring proper clearance if your rims have any serious depth to them. With such a variety of options, you can be sure the flat kit is complete for your road, commuter, gravel, mountain bike, or even your vintage bikes with odd valve types, like Wood, or Regina.