This is for a specific model of the Pair Eyewear glasses so that I could print my own for my wife. I believe it is a Kirby model, but not certain, I didn't order them.

There is holes for a 6mm x 2mm round magnet. When putting the magnets in be sure to check the polarity they attach to your frames BEFORE gluing them in. The hole is a little tight on purpose.

Edit Adding a little detail on some frequently asked questions here:

The frames print flat, to get the curvature of the frames I fill a cup with hot water and dunk them for a few seconds then set them on the glasses to mold them.

This is also one of the easiest things to design so if you want to make your own all you really need is a camera and Fusion 360 but you could probably replicate the process in a different software. Take a photo of the frames next to a ruler, get the photo as flat and square as possible. Import that photo into Fusion 360 and scale it to the ruler in the photo. Carefully trace the frames with a spline tool or whatever you want. Extrude and you are basically done! It took me a few test prints to adjust the scale perfectly and then I added the holes for the magnets later.

You are welcome to shoot me a message, I don't mind, but I don't log into Thingiverse often to check messages, so sorry to the folks that did and I didn't get back to them until months later :)