Armarkat 77" Solid Wood Cat Tree Solid Wood Post Diameter: 4.5" and fully covered with sisal rope Overall Dimensions: 43"(L)X42"(W)X77"(H); Base Dimensions: 28" X 22"; House Dimensions: 18"(L)X18"(W)X12"(H); Perch Dimensions: 18" X 18"