How do you attach an object (eyebrow) to a several bones?

Sorry, I’m a bit of a noob at blender. I downloaded a rig online which had no eyebrows, however it came with 5 bones to move the eyebrows, I’m guessing that the reason why there are multiple bones for an eyebrow is to be flexible with facial expressions?

I decided to make an eyebrow by editing a cube. I have just finished it but I need some help attaching the eyebrow to the multiple bones to allow it to bend

This looks like a pretty good introduction: