You have this one type of rebutia pygmaea, under the name Rebutia torquata
Its somewhat common in cultivation, though really obscure.
I used to think they were a type of echinocereus.
Anyway, as a plant they are weird.
If the lighting is too dark, they etiolate easily.
If its too bright, they sunburn just as easily.
They have a "golden zone" which involves very bright, indirect light where they grow.
Water it less, and keep the soil draining and coarse.
Never had one bloom, nor had one live as long as my current one.