They're from Peru. They're ceramic. They're hand painted. Drilled top to bottom. Approximately 1 inch long. Some of the PCB holes will take a 2mm cord, some just close to a 2mm cord. Sold in units of 5 so to buy 10 choose 2 units, to buy 100 choose 20 units. The supplier to the universe for this item ,JP Imported, has called it quits so as of 9/17/20 I may be selling the last of what is available to me.