Zero-plastic ballpoint pens
Billions of plastic pens are produced annually, and most are only used once before being disposed of, ending in landfills. Zero plastic pens would thus be very instrumental in containing the ever-worsening plastic waste crisis.
Here is another zero-plastic pen made from 100% biodegradable materials.
https://thenote.earth/product/bamboo-pen-classic/
I found this sustainable pen made from bamboo!