Gently used 6 inch tall sturdy plastic bed risers. Pen is in picture to give visual of size. At the base of the risers they are 6 and 1/2 inches by 6 and 1/2 in. They narrow up to 4in by 4in at the top and the inside of that top square is about two and 3/4 inches by 2 and 3/4 in to fit the four feet of a bed. If you are looking to increase storage space under a bed these are a great tool! For those who don't know, you just put the four feet of the bed on each of these. Sorry no picture of this right now. We used them for about a year but no longer need them. Looking for a new home.