These wall hanger mounts are sized for Walther PDP magazines. There are two versions, one for 4 mags, one for 8 mags.

The purpose of these is to mount on the inside of a gun safe door to organize your -magazines, loaded or unloaded.

I have printed these designs in PLA and PETG, both work equally well. I would use PETG in areas where it is open to the weather or sunlight since it is UV safe.