Mammillaria species- Flower Show, Mumbai
Cactus for ID : Flower Show,Mumbai : 230213 : AK-3: Another cultivated, ornamental, potted cactus at the flower show in Mumbai, during Feb, 2011.
Id please.
Hard to tell without flowers ..., But overall, it looks like Mammillaria rhodantha to me, if the flowers are a deep red, that is probably it.