1.25 inch pin with 2 pin posts so it will not spin when worn and 2 rubber pin backs that hold on tight. The pin is made with enamel is nickel plated. We are the only source of this collectible pin and we also offer Chief Master Sergeant rank insignia patches for the Senior Enlisted Advisor of the United States Space Force and Command Senior Enlisted Leader of United States Space Command, Space Command Uniform Campaign Device, and display stands, all sold separately.