It’s only visible if you manipulate it with the other hand, otherwise it’s flat enough to be completely in invisible. MRI is fine! The technicians are often somewhat worried but usually accept it just fine if you refer to online documentation. The chip is unaffected. It’s too small to be detected by any metal detectors, so no issues at the airport. You can’t feel it outside of touching it with the other hand. There is a pinching feeling a few weeks after install though but it disappears completely.

I have four; one small glass capsule type in each hand and two flex type in the forearm.