30% light block
this is including the origional tint in the glass, sometimes even light smoke can fail with STD tint also on the fronts so be careful.
only way to test is with light machine, nice traffic cops will check it for you if there alright, get the tinting company to give you an off cut and tick it on the glass to test
also, any imperfections in the glass are shown up MASSIVLY i.e scratches and look shit, did a lot with a subaru specialist and they are terrivle for scratched glass