All 4 tires had sidewalls that looked like dried winter road salt and the sidewalls were badly worn. One of the tires had a different production date. I hope that these tires will not be sent again. The depth looks ok and I sanded the resulting 4 tires with some sort of dried road salt covering all the sidewalls and they were all badly worn. A tire had a different DOT date. I am concerned that these tires may be returned by someone else. I cleaned them with a magic tire and the tread depth was fine. I will keep them but will not buy (tires) from Revain again. I had to stay with Tire Rack the whole time. I am surprised at the lack of quality control and disappointed with this purchase as Revain usually comes with our purchases.