Most metal runs use welded wire mesh or built-in vents for airflow, and multiple access points for care: common features include roof vents, large front doors, dual-door designs, and models that list multiple access doors for feeding, cleaning, and interaction.
Many metal runs offer caster or wheel options for mobility. Typical configurations include 360° universal wheels or four 360° lockable wheels; some models have lockable casters to keep the run stable when parked.
Some metal runs pair a metal frame with chew-resistant panels—commonly high-quality acrylic or tempered glass—for four-sided viewing or deep glass bases; other models use full metal mesh and do not include solid panels.
Common safety features include reinforced or half-inch grid wire to deter escapes and extra-deep trays or deep bases to keep bedding contained. Some listings also highlight reinforced grids or locked doors for added security.
Common features that simplify cleaning are removable or extra-deep trays to contain bedding, lift-top or removable mesh panels for access, and washable or removable accessories that make spot- and deep-cleaning easier.
Most metal runs require adult assembly. Assembly requirements vary by model: some advertise tool-free setup, others include basic tools, and some expect you to provide tools. Check the product listing and instructions for estimated assembly time and whether tools are included.