Bottom wire 14g. galvanized after welding. Door is on 18" side. Plastic or metal tray. Trays are slide out. 4" high urine guards on sides and back. All Premium Cages have babysaver wire on the front. Bottom wire is 1/2"x1"galv. after welding. I only ship these cages in kit form (knock down). If having them shipped Please order them in kits.