They are round and black and fit my Arens IkonXD 52.
After Popping a front tire with a Black Locust thorn and being unable to reseat the bead due to the size of the tire I got fed up and went looking for a tubeless non inflatable tire to replace it.
I ordered a size that walmart said would fit but it was too wide. If you have an Ahrens or Gravely Get the 11x4-5. I wound up using the existing axel shaft with the included bearings and spacers) Greased them up using the zerk fitting (1 was fine the second the ball bearing was no good but I the hole was threaded properly so I scavenged the fitting off the old wheel. Zipped the nut on with an impact and was mowing in no time.
For my particular install I aligned the grease fittings to point towards the outside, And I needed the bearings that were installed the fat and thin wide black spacers and capped them off with the washers. the axel was in this order,
Washer/Thick/Thin/Wheel/Thin/Thick/Washer.
In conclusion yeah, I paid for em with my own money they did what I needed and wound up being cheaper than 2 replacement inner tubes that would have wound up getting popped by another thorn.