All plastic, all printable padlock. To lock things, you know? Comes with key! Download the PadLock STL.zip, and extract to use the files.Print & Enjoy!Just print out, and put together according to the Assembly.STL file. the pin holes are 1/8", so if you don't want to get the appropriate dowel, you could be tricky with the sandpaper and make your 3mm plastic filament work in its place.NOTE I have only included the .STL files in the .ZIP, but if you would like me to upload a specific filetype, don't hesitate to ask!