this mammillaria?

hi to everybody..
what's this mammi?

Hi Alessando,
It isn't immediately recognisable to me. My first thoughts were towards M. albata, but the central spines look longer and don't have any darker tips. I'd like to see a clearer and closer picture of the spines before making a firm judgement. Can you say something about the size and the flowers if it has flowered for you? It does look familar but I just can't place it at the moment!

The photo isn't all that clear but If I was to take a guess I would go for M.vareaculeata. If the spines were tipped black then it would be M.saetigera woodsii.

Mam.meuhlenpfordtii

I did think of M.meuhlenpfordtii but that species tends to divide dichotomously and not produce offsets, also the spines are more curved then straight.
We really need a better picture.