This rim is built specifically for the rigorous demand a unicycle puts on a rim. It's the same rim as the double walled eyeleted alloy rim used on the Nimbus 26" Mountain Unicycle.
Built wide and strong for fat tires and heavy abuse, these are the choice when strength is the most important factor.
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.
Width Outside: 42mm
Width Inside: 32mm
Spoke Holes: 36
Material: High Quality 6061 heat treated aluminum with box section
Finish: Black anodized
Nipple Eyelets: Stainless Steel