This stuff is also available on eBay in different widths. I now use it on all my rims tubeless or not. My friend bought some wheels from Fairwheel Bikes and I'm pretty sure they came with this stuff as well.
We buy it by the mile, have been using it for around 8 months. The 1" width is perfect for 18 to 20mm bead seat widths. By the time it drops down into and conforms to the channel, it's not too wide. You have to be careful with the adhesive when you're starting it, the rim has to be 100% dry and clean. Smash it into the channel with your thumb, being careful not to nick it with your thumbnail.
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