This is the sealing tape that is included with most of Stan's bundled tubeless systems, and is required for rim use. It covers the spoke hole and bare essentials to provide gap seal to prevent fluid leakage when running a tubeless setup with a NoTubes tubeless valve. The tape also works as a standard rim strip with a tube. The tape roll is 10 yards long which is ample for a five 26", or four 29". One side is adhesive and has some stretch to it. The material is quite robust and shouldn't give you any issues during install or when in use. Choosing the correct width is crucial. NoTubes make recommendations for all of their rim designs and has excellent product information and installation videos on their website.