These are just the right height and come in 2 separate pieces for a full-size bed.  I have a slate board but, felt like the mattress needs a little more support than it was giving.  Super easy to maneuver these box springs around and place them in the bedframe.  Did on my own without any issue.   There is a bit of space in between the 2 pieces (you can see in the photos) but, I didn't' notice anything while sleeping last night.