Super heavy steel bars 3/4"square. Heavier steel frame. Black powder crinkle coated scratch proof finish. Two sliding locks for large door. Locking roller wheels on all corners. Upgraded steel slide out tray for easy cleaning. Carpet and mattress in great condition included. Frame labeled for easy assembly with assembly tool included. Amazon price $190.00 My price is firm .See it and you will buy it!! My 90lb dog passed this week and I will buy a very small replacement pet.