This is a 50 BMG key chain. It's the biggest key ring we offer at just under 5.5". They are definitely an interesting conversation starter. They can easily be converted to a necklace as well. Unlike some others, this one is made with high quality components and will not fall apart. This product is completely inert, it cannot be fired or reloaded. Please know that this is a key chain, it is not designed or intended to be used as a weapon. We will not be held liable for any prosecution or civil action that occurs as a result of the misuse or possession of this item. Please use common sense when carrying this item in certain places (i.e. courthouses, airports, or anywhere else that your possessions may be scrutinized.) I have many other calibers so if you do not see the one you are looking for, contact me, chances are I can get it made up for you. Please also contact me for high quantity purchases. I am able to supply nearly any quantity, and have displays available for in store sales. I accept money orders as well as personal checks. I also accept Paypal. Thanks for your interest. God Bless.