These are the plug type drop outs. Like the name suggests the plugs on the dropout goes inside the chainstay and seatstay. The rings you see are silver. They will sit inside the tube on top the plug. Then I will heat the plug, melting the silver till I see it run out where the outside of the tube, and plugend mate. I'm not near read to do this yet, but I thought i give anybody interested to preview and maybe something to think about till then.