Module polarity?

Does anyone know if the little brass 532nm DPSS modules have any polarity assigned to the brass encasement? Are they neutral or case positive? Planning on doing a combined red/green handheld with one of these and I am trying to determine the easiest diode to combine with.
Thanks!

they are case positive

I concur. The diode is case positive and pressed into the module, thus making the module case positive.