Hi! So I don't know what exactly its called but I found a seller on Etsy that has a VERY accurate belt and they show it to be just a gold/bronzeish metal plate. I liked this seller because they worked directly with JJ Industries and Machine Craft. Both of whom I found out actually made some of the parts for the show, Machine Craft designed the parts and JJ Industries manufactured some of the parts. I learned this from a face to face conversation with Machine Craft. I ordered the whole belt with the aluminum ammo cartridges just today actually. Expensive but its the most accurate belt I've found in my one year search!