The glass itself is not actually tinted - they use what feels like a film that is sprayed on the inside of the bowls - within 15 minutes of using a brand new red bowl, the film began to flake and chip away at the top - best advice is to buy a clear one so you dont have floating pieces of plastic in your hookah
I have a large "rotating" hookah with one of these large bowls on it. They are strong and work excellent!
good shisha