I also call these charms: hearticles (smart heart particles :))I resized them for myself into a suitable format in the program of my 3D printer.Assume that this is possible with other 3D printers too.They can be linked together in different ways to make a bracelet or a necklace and even a ring from one single heart charm. I made them closed, with small opening on the bottom (to be able to link them) and small opening on the side. My grandkids will have fun :)P.S. in the next upload are the smaller charms which I was not able to upload under this entry.