Firebird works best on steel plates, steel silhouettes, steel gongs, steel paddles and other flat steel surfaces. Firebird Targets require attachment to a surface that will not bend or move when struck by the projectile. Paper, cardboard, rubber, and plastic target backers are not firm enough to ensure proper detonation.
Smaller calibers require harder backing, such as steel or hardwood. The harder the material, the greater the report and flash will be: wood backing will give a smaller report and flash and a steel plate will give a much louder report and bigger flash.