The regular height, All Wood Classic three tier Tree model is forty-six inches tall and is also available in a fifty inch tall version. It is a modular designed tree with both models having three large Cedar Flats. An Inline version of the tree is available allowing the posts to line up which can help in areas where space may be limited. All of the All Wood trees may be used outdoors or indoors to aid in maintaining a "near" hypoallergenic environment. However, a Sisal Rope option is available for indoors that gives your cats somewhere to scratch other than your furniture and rugs.