Abec11 Retro InvertZ are extremely versatile 61mm pool, park, pipe, and slide wheels.
This "invertible" wheel gives you 2 great different ride characteristics. The InvertZ "normal" position puts more of the wheel's contact patch to the INSIDE of the bearings, providing better traction and more uniform wear. When the same wheel is inverted on the axle (more sideset), it will slide longer and more predictably.
The Classic Park formula at 99a slides the most when mounted sideset, and hooks up sooner when inverted.