Front and rear windshields along with front driver and passenger window is 10%... Rear passenger windows can be 100%.. all this only with the required police permission and installation from the authorised and licensed tinting brands like platinum, alnahdi, titanium, 3m and others... i bought my car from a police officer and my registration card mentions rear passenger windows as permitted to tint; for all windows I'll need to get the required permission or keep the tinting shop bill in the car... That's what they said...