yep yeast and sugar, 2 2 liter coke bottles, and Ive still got to get those caps, they're not bare tho, they're covered in a thick layer of hot glue, I couldn't ground them if I tried, and its are only a 12 volt dc current going to pc fans , I could lick the bare wires, the ac-dc inverter would fail and I MIGHT feel a tiny shock, like a static discharge.