I bought this one like that. It was so much bigger though! Multiple spiky balls all tucked up together that looked like little pillow. And I am not sure if I over watered it, or the shop did, but few weeks later when I was repoting it most of the big ones were half rotted, lots of little ones were already empty with spines coming off and falling apart. I took the healthy and rootless ones and potted them in 3 separate, small pots. The big ones I tried to clean up, remove the rotten part, and there is still chance to save them.
Mammillaria prolifera
Shot with Nikon D5500 + Sigma 105mm lens
(ƒ/14, 1/320, ISO160)
All photos and text are my own.

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