The large CurvyNest is a 4-story apartment for cats! Uniquely designed with sinuous curves, CurvyNest adds style and flair to your living space. The contour fits cat bodies perfectly. Its a great place for cats to perch and enjoy some private space. QUALITY. And then some... Curvynests elastic structure design allows it to withstand many cats at once.  CurvyNests spring-like structure creates subtle bouncing effects that cats love, much like a comforting cradle. Large and small CurvyNests will accommodate multiple cats at once -- offering each a private, comfortable space to rest or play. The main body is made of MDF material with a painted outer surface. Fiber weaving is attached to the curvey surface to provide scratching board functionality. Comes in sizes: Large: 26(D) X 19.1(W) X 39.6 (H),  32 lbs. Small: 19.4(D) X 19.1(W) X 22 (H) 15.4 lbs.   Read less