100% cotton, knotted, colored rope. Bolts to the cage with plastic end cap provided. Can be attached vertically or horizontally. Provides preening entertainment as well as a soft comfy surface to perch on. Two sizes available - Small for Parakeets and other small birds - measures approx. 6" long and 5/8" diam. Medium for medium to large birds - measures approx. 7" long and 7/8" diam.