The Extended Helmet Crescent decal sticker measures 2" tall and 4.5" long. It is designed to be placed directly under a full size Helment Crescent Rocker on a standard fire helmet. It can also be used on other surfaces including windows. Because of the rounded rocker shape, they may not fit properly on some helmets. If you need another color or a custom size, please email or call us. All of the decal stickers are printed on a high quality engineer grade reflective material and under normal conditions will last 5 to 7 years.