This is the motherplant of all mammillirarias:
mammillaria mammillaris

Yep, I reckon that's what it is! Nice specimen Roland.

CP

It looks incredibly happy.

Very festive looking for this time of year too, I might add.
Amy

thanks everybody for the info. i actually posted it once before and by accident posted it again this time..."Ohio _green_ thumb"...here in SE Asia....the weather is rather warm...although a bit to wet this year..but it still thrives.
have a lot more to be ID'd and little by little they will be posted. Lot's of cacti on sale here in the RP...but the sellers have no clue what they are called...or they just give them 'funny' names.
thanks again and happy holidays to all of you
Roland