These 13 slats were my savior. they were ordered to be used with the "Ainslie" queen bed that was delivered with missing slats from another manufacturer. 

I was able to place these ones vertically on top of the 3 original ones that are placed horizontally to create the best possible support for my new mattress. When these slats were delivered, there were two groups. one of 6 slats and another of 7. each grouped slats are attached with a red ribbon at both ends. It simply worked out for the best.

Thank you so much for also selling these slats individually. they are very sturdy. 

Now I can fully enjoy my bed.