The classic currency of Hyrule for all its iterations, now holding a protective grip on the important keys to your kingdom! Or dangling as a fun trinket from whatever you choose.
Measuring: 5.75cm by 2.5cm 
And weighing: 0.01kg (10g)
 
They are very lightweight.
These charms are designed by me! (Then redesigned aaaand redesigned again) to print nicely!
It is 3D printed on my home printer and then I re-inforce the keyring hole with a grommet for longevity!
 
Want to see where rupees come from? Check out these bloopies keychains!