Stan's NoTubes Yellow Rim Tape has become the standard for achieving a proper seal when converting "normal" rims to tubeless. And by normal, we mean non-UST rims with spoke holes that pierce the outer wall of the rim. What's the big deal with Stan's Yellow Rim Tape, you ask Well, we don't know how it does what it does, but it makes the magic happen. When applied correctly, it provides a durable, long-lasting seal.