Ma is the pluralizer par excellence in Palenquero, though it is never obligatory (context alone often suffices to mark plural, and ma is omitted).
Interestingly, Spanish los (masculine) and las (feminine) never hold a pluralizing function, though these two plural markers from the superstrate are fairly common in Palenquero, as they are used in frozen expressions like a la(s) kuatro 'at four o'clock'.
For details and pertinent references, see Schwegler (2007).