This listing is for a very nice United States Navy. Naval Special Warfare Group Eleven NSWG-11 Navy SEAL Team 17 ST-17, Navy SEAL Team 18 ST-18 Chief Petty Officer CPO Challenge Coin. This coin is 4″ x 2″. This will make a nice addition to any collection. Any questions, please feel free to ask. I always strive to deliver prompt and accurate results. If you are dissatisfied for any reason, please let me know and I will do my best to resolve the issue to your satisfaction. Just add the items to your cart and request an invoice.