Mercury Wheel's Tubeless Tape is 21mm wide (update as necessary) and uses a tenacious adhesive that is safe for carbon and alloy rims, and compatible with all sealants. It has just enough stretch to form to the rim, without being too flimsy. Sold in rolls of 9 meters, plenty to cover 2 wheels.
If you're looking to adapt your Mercury wheels to handle a different make/model of cassette cogs - this is the right spot. You're also in the right spot if you've put some miles on your wheels and you're ready to grab a fresh freehub of the same type.
To order a replacement, you'll need to know a little about the drivetrain on your bicycle and the specific hub used on your wheel.
The Hub Model # must match your hubs or the freehub body will not fit correctly.
If you'd like some help determining the right freehub, email a picture of the hub shell to firstname.lastname@example.org.