Usually titanium, but yeah sometimes medical stainless steel. Both are non-ferromagnetic, especially titanium. These balls look like they could well be normal steel or any other metal. Also, implants - unlike these metal balls - are usually screwed firmly into your bones. So yeah, implants should be mostly fine on MRI. Loose balls of dubious metal? Wouldn’t advise it. Keep in mind MRIs are literally powerful enough that metals in tattoo ink can even be an issue - which the article you linked mentions itself.

In general, metallic orthopedic implants are not affected by MRI.

This isn’t an implant though. Massive difference.

That only creates more questions 😅

When… what? 😂

Sorry, what exactly about Facebook marketplace? Too low prices, or too high? Or do you just mean the fact that theres no bidding on there? Haven’t been on there in a while so not sure what the correlation is.

Yeah, like… You can literally open it in your web browser wtf

I would not be able to find anything lmao…