The Zipp Tubeless Kit is the best way to assure a proper seal between your tire and rim, avoiding any leaking or loss of tire pressure. Each kit has a specific width of tape and length of valve stem to properly correspond to your particular wheel. This package includes two valve stems, tape, and a valve core remover. With this kit, your Zipp tubeless tires will be set up for smooth and reliable performance so you can focus on riding.