3 (!) Bed Risers or Planters

I don't know what happened to number 4, but perhaps you need an odd number of bed risers to complete your set?

They are just under 4 inches tall and lift the bed by ~3.5 inches. They are ~4.5 inches on a side at the widest part at the bottom
They may also function well as plant pots -- see second photo -- if you flip them over.
Pick up in Montgomery Village near Watkins Mill HS and the MVF.

Thank you! Susan