This med hex size: 5 x 7". This hex is fab, as you can see it has 5 sides you can turn it onto, 6 including the lid. I like this feature for mantis that are molting, if the mantis is apparently in the wrong position you can turn this hex to help it without disturbing the mantis. This size hex is good for medium to large mantis and spider caging or any other insect that needs a large home. Cloth Vented with feeder hole included.Tennis balls not included, nor spongebob!