Size: Third order, 29.5"*17"*3", adjustable to 3 different heights(13.8", 17.7", 21,2"); Fourth order, 39"*17"*3", adjustable to 4 different heights(13.8", 19", 22.4", 24.8"). Two modes are available. Choose Stair Mode when the height is high, and use the ramp when the height is low, which can quickly convert from pet stairs to pet ramps. It can be freely selected according to the climbing height, which saves the dog's physical strength and is more friendly to it. The surface is covered with hard-wearing, soft carpet, and the pet steps are made of pine wood. The surface is finely polished and the structure is firm. The bottom is supported with sufficient load-carrying capacity and stability.