What is the red outline in Static Mesh Editor?

[CabbageDev]

Hi everyone, I purchased an addon from marketplace for my VR project.

Inside the static mesh there are red outlines with a label. What is it? Where can I find more as to what it does?

Here is the screenshot. Thank you!

[ClockworkOcean]

I’m pretty sure it’s a socket

[CabbageDev]

Ah ok! Thanks!