Hey Friends! Some kits may not have a small metal ring as I am temporarily out of stock. I usually provide one for each mobile to hang it with! This is the very last piece of the kit that you would use. Instead of using the metal ring, you can just simply tie a loop at the top of the string. If you would like for me to send this piece to you once the shipment arrives, just send me a message and let me know! So sorry for the inconvenience, and thanks for understanding!