Selenite spheres are hand polished, not machine polished.
The reason they are hand polished is because selenite as a crystal is soft and has grains that change direction. So machine polishing does not work well.
This means that they can differ a little in their diameter and also mathematically speaking the sphere shape can vary a little, but it is hard to pick up with the naked eye.
Each sphere will be unique is its internal crystal structure and translucence.
The plastic stand is included.