Unfortunately, the article is missing the description, I was not sure if 1 or two aerators are sent. There are two different aerators (with 7.5 l / min and 15l / min) and a key supplied by Neoperl (TT). A perfect fit for our Grohe Essence faucet. One point deduction because the plastic of the key to even use is totally worn out. Very heavily calcified valves you do not get on with it.