Mammillaria ID

Mammillaria......

Hi Marco,
This is puzzling me at the moment, and would welcom eopinions from others.
With dark spines, white wool and those flowers, my first thought was Mammillaria woodsii (or hahniana ssp woodsii). Usually there are only 2 central spines, but is reported to have 4 centrals like your plant. So it could be, and there aren't many Mamms which have such black spines.

Thanks Chris, I also thought that could be a woodsii.

Marco