what you're looking for are called "dichroic mirrors" or "dichros".
Onestoplasershop.com has them: http://www.onestoplasershop.com/dichros.htm
i recommend you ask for the "high efficiency" dichros when you contact them

Originally Posted by
juanmasa
hello good day I'm looking for some glasses like these for a laser rgb if someone has sent to Mexico to appreciate them,
in these parts is not such material



suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.