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.
Below are the available bulk discount rates for each individual item when you purchase a certain amount