The battery holder is plastic. The fahnestock clips are metal terminals on each end of the holder. Fahnestock clips are flexible metals with a rectangle punched out of one end and a loop punched out of the other end. The clip is bent over itself so the loop can be pushed through the rectangular opening. A wire can be inserted through the loop and the spring force will hold the wire in place.
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Excellent. Just what I was looking for. Came in plenty of time to wrap for Christmas.