These stairs may not be the prettiest, but OMG they are the BEST!  I have an arthritic kitty who is partially cross-eyed (he is a Siamese), and is approximately 20 pounds.  The width of the individual stairs, and the fact that the stairs slope, make it so much easier for my boy to get up on my bed. My bed is high and I noticed that he was having difficulty jumping up onto it so I knew I needed to get him stairs.  I researched a lot of stairs but so many of them would not work because 1) the actual stair was too narrow, and 2) the height of the stairs were not tall enough to reach the top of my bed.  Another bonus to these stairs is that because they are plastic, the stairs are super easy to move around which I need to do on a daily basis in order to make my bed.  Bravo to the person who invented these stairs :o)