Thanks to their multi-layer construction, air-flexx valve extensions offer many advantages over conventional valve extensions: They are flexible, yet rigid enough to be used without a rim clamp (exception: air-flexx 315 mm, 415 mm, and 1000 mm). The material is extremely durable and will not become brittle during the normal service life of a tire - and far beyond. air-flexx valve extensions ensure that you can easily check your tire pressure at any time.