The roof lifts on hinges with wire mesh set into it, so a pet can be watched and reached without dismantling anything, and air moves through the enclosure. Inside, 22" x 14" x 15" suits hamsters, guinea pigs or hedgehogs, with a shelf below for bedding and food. Fir wood with acrylic panels stands 31.5" tall on its own legs, keeping the habitat off the floor and away from drafts. Overall 23.5" x 16" x 31.5". Assembly required; net weight 15.5 lbs.