These are all 46mm X 30mm X 8.5MM
Work these slow as I have found acrylic chips if you are going too fast.
As you can tell in the pictures hopefully, the yellow is pretty see through, you will be able to see what is behind it easily. The red, is also slightly see through, you will still be able to see what is behind but not as much as yellow. The blue looks see through but once finished looks real solid. The black is a completely Black Black with no other colors. All of these keep their color though once finished.