Product details:

Tank Toppers give your critters tons of extra room to romp! Constructed of 1/2 wire powder coated (Black) for easy cleaning fits on any standard 10 gal. (approx. 10 x 20) aquarium (not included). All ramps and levels are constructed of 3/16 x 3/16 wire powder coated. Cage wire size: 1/2. Ramp/Shelf wire 3/16 mesh.