By using sturdy materials of High-quality MDF Board and High-transparency PVC board in modern design and innovative architecture, it fits perfectly in all domestic spaces and gives off a personal living atmosphere. It has enough space to guarantee the required litter height. This way your pet can dig and hide as wishes and give your pet a comfortable and sheltered feeling like a natural cave. Also, it gives more chance to decor your hamster habitats, arranges your hamster's living areas, set up hamster wheels, platforms, or more exploring toys for them to play, enrich their entertainment, keep them happy & healthy The top opening of the small animal cage allows easy access for maintenance and feeding. the Curved slits in the cage top ensure adequate ventilation and optimum air circulation. The practical cover on the roof ensures a quick and easy opening of the entire roof surface. The rodent cage distinguishes itself by the easy to care for, smooth surfaces, in protected design, modern style, optimal air circulation A spacious cage for small-sized rodents, such as hamsters, degus, mice, and other small animals, an ideal welfare area in extra class for your rodent According to different desire or room bigness we have 3 sizes to offer, please choose the reasonable size you prefer to purchase depends on your desire Here are measurement details of Niteangel Bigger World - Small Animals Cages, please see it for your reference: Size: S(Small) Inner Size:30-inch L x 15-inch W x 17.7-inch H Outside size:31.5-inch L x 16.5-inch W x 19.3-inch H Size:M(Medium) Inner Size: 39.4-inch L x 19.7-inch W x 19.7-inch H Outside Size:40.9-inch L x 21.2-inch W x 21.2-inch H Size:L(Large) Inner Size:47.2-inch L x 19.7-inch W x 23.6-inch H Outside Size:48.8-inch L x 21.2-inch W x 25.2-inch H Package Included: 1x Niteangel Small Animal Cage