The Kaytee Critter Trail Super Habitat boasts 540 square inches of living space for your large breed hamsters and gerbils. The expandable port offers you the ability to connect to other Critter Trail accessories and habitats. Narrow ¼” bar spacing provides safety to your critter. There is a large top door for access and bunny ear latches for easy assembly and cleaning. The fully assembled dimensions are 30”L x 18”W x 16.5”H.