Rebutia heliosa grafted
(This plant comes in a 3.5 inch pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
This is a grafted version of the Rebutia heliosa.
Cultivation and propagation: They like bright light, cool and dry conditions in the winter.
Sun exposure: Suited for sunny-brightly exposure; can tolerate light shade.
Hardiness: It is very cold resistant as low as to -10° C or less for short periods of time.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz