Your Cinammon Cactus will ship in a 4” black plastic nursery pot. Your plant will be similar to the those pictured int he smaller black pots.
Cinnamon Cactus is a super easy little cactus to grow. It like a lot of sun. Let it dry out between waterings.
I have a couple of older Cinnamon Cactus and the largest is about 12” tall. But you can keep yours trimmed and you can keep your plant at your desired size.
I don’t let my rufida minima get below 40F.