This rim is built specifically for the rigorous demand a unicycle puts on a rim. Its the same rim as the double walled eyeletted alloy rim with machined sidewalls used on the Nimbus 24" Mountain Unicycle.
Should you want to build the wheel, here is a link to the Spoke Calculator so you can find the correct spoke length you need.
Spoke Holes: 36
Material: High Quality 6061 heat treated aluminum with box section
Finish: Black anodized with a braking surface
Nipple Eyelets: Stainless Steel