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These are Mattel’s WWE Deluxe Display Stands. They are intended for WWE figures but honestly these can work with any figure series you decide to use them for.
There are 2 types of display stands at different heights and you get 2 of each. Each oval section has a WWE logo and small peg that you can connect at the bottom of the left boot of an action figure it fits.
You can stack them and create 3 different heights. Naturally, the more you buy of these the more crazy heights you can achieve.
I decided to try these out with my Batman figures (back 2 rows) and they make my collection easier to see.
These are available at MattyCollector.com and wrestlingfigures.com. Go for about $20.