Cages are 14g. galvanized before welding wire. Sides, Top. Bottom wire 14 gauge galvanized after welding. Door is on 30" side. These cages aren't designed to work with trays. You will need clip pliers. These cages are knocked down for cheaper shipping. Clips and door latch are included in the kit. If you want this cage shipped it must be a minimum of 2 cages. Otherwise ends up damaged.