Stan's 27mm Rim Tape is recommended for rims with an internal width of 25-27mm. The tape is airtight, non-porous, super thin, will not affect tyre fit, and does not leave a messy residue when it needs to be replaced.
When running less than 45PSI a single wrap of tape is adequate. A double wrap is needed when running more than 45PSI.
Please note that Stan's Yellow Rim Tape by itself is not a tubeless conversion. The company says traditional (Non-BST) rims need a Stan’s NoTubes rim strip to achieve a secure tubeless setup. Using only Yellow Rim Tape and Stan’s NoTubes sealant on a conventional rim can result in difficult inflation and "burping" issues.