Heart Lanyard Tsurikawa
thingiverse
They're using a 25mm device that comes equipped with a lanyard, along with a separate 20mm model.
Download Model from thingiverse
With this file you will be able to print Heart Lanyard Tsurikawa with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Heart Lanyard Tsurikawa.