This is a steel framed cabinet on heavy casters. Unit is insulated with rockwool, including the base. Outside is unpainted OSB. Has solid wood doors, plank flooring, and two ventilation fans. Used in a workshop or other setting where noise and climate control is important i.e. for a compressor, electronics, etc. It's approximately 48 inches across by 42 inches wide by about 80 inches high (verify in person).