The Helmet Crescent or Rocker decal sticker measures 15/16" tall and 6.75" long. It is designed for a standard fire helmet as well as other surfaces including windows. Because of the rounded rocker shape, they will 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.