If you want to hold the GPD Win Mini more comfortably, you can install these handles.
They are simply screwed onto the casing. Of course, this makes them fit perfectly - but you can't just take them off and on quickly (at least not if you don't have a screwdriver with you).
This takes away a bit of the portability of the device - but if that's not a problem, the handles are really a nice addition.
The GPD Win Mini is of course not included, it is only shown as an example in the photos.