They're a set of magnets that mimic V4's morphs, allowing you to morph V4 using any of the DAZ morphs and have the clothing fit that morphed form, even if the clothing doesn't have those morphs.

And at 10 dollars, there's almost no reason for someone who uses V4 not to get them.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.