These green studs are made from repurposed calculator buttons: ON & OFF. They were produced of some kind of plastic (perhaps ABS) and when my science calculator broke down I removed them from it and created these nice, geek post earrings.
They're rather tiny, the width of such calculator key is just 7 mm.
See if you like other stud earrings I've made of recycled calculator buttons:
https://www.etsy.com/shop/dekoprojects?section_id=16861859
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