These twin bed size bed slats can provide extra support for your sleeping needs! They lay on your bed frame, underneath your box spring and mattress, and are held together with the above materials to help keep the slats in position. Please measure the width of your bed prior to purchasing your slats. Allow 1/4" play on either side of the bed frame when measuring. The slats alone are not designed to support just a mattress, but add to the support of your mattress and box spring. If you don't see the size you need for your particular bed, please contact us and we will be happy to see if we can meet your specific request. Total length is approximately 72" long.