Combination rim and tubeless sealing tape available on a wide variety of widths to fit different internal rim widths, from skinny XC race hoops to full-on DH race wheels
For DT Swiss Rim and Wheel compatibility see URL link, for non-DT Swiss rims use the size up from your internal rim diameter, i.e. if you have a 25 mm internal diameter go for a 27 mm tape so that the entire rim bed is covered
This is a rule of thumb and may not work with some more unusual non-DT Swiss rim profiles
10 metre length will seal five wheels, even 29ers