Those are Texas Tomato Cages in the picture. The 20" is probably a better size for container growing as there's a good chance your running 3 or less stems in a 15,10. or 7 gal container and don't need the the room. I have the 24" cages, they're a better fit for 20gal and larger containers. They fit over the larger pots and with more room they'll ventilate better if you're not pruning.
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