When it first arrived in was in a long cylindrical box which led me to believe that it contained individual boards. After I unwrapped it and saw that the boards are securely linked together by heavy bands I thought this just might work. After I placed it on my bed railings it fitted evenly and perfectly! Then I laid my box spring and mattress on them. This has made such a tremendous change. I'm actually sleeping better because my bed now has proper support from head to toe and from one side to the other. It's diffidently true in size and fit. I love it and would encourage everyone to get a B-Board. It just might save you from vacationing in the chiropractor's office.