Mammillaria sphaerica Family: Cactaceae. An unusual species with extremely long tubercles (arms with spines). It makes big yellow flowers during the growing season. Will clump in time. Takes normal cactus care. Protect from frost.
This species is very similar to M. longimamma and seems to differ in having slightly shorter tubercules and more bristly spines.
You will receive a plant shown in the last image or one similar. Plants shown in the 4" pot.