Rabbit 2-chamber exploring room has the diameter of the entrance is around 20cm. The Dimension of this hideout house is 60cm L x 30cm W x 30cm H. Each Hideaway arrives ready made and is built using 6 mm and 9 mm Plywood. As these are made from plywood there may be some cosmetic marks on the ply but this doesn't affect the item. If you have a specific size please message me for a quote! Check out my other items!