A short columnar mammillaria, with somewhat thin stems, dense spination and lots of tubercles. Care is standard as cacti go, and it is one of the easier mammillarias to care for.
With age, the plant will begin to sag downwards, turning the plant into a hanging succulent.
This is, of course, detrimental to the stem, as the part of the stem touching the edge of the pot will die off, with the rest of the stem slowly dying afterward.
Sometimes, the plants are potted hanging completely downwards (through the bottom of a hanging pot), bypassing the stem necrosis issue. Ones planted in the ground avoid such problems as well.

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