From the Manufacturer...
The Firebird is our most popular upwind distance driver. The Firebird’s combination of superior speed and stability make it possible to throw drives into the wind with confidence. An excellent disc for throwing long range flex shots. A favorite of sidearm and overhead throwers, too. This disc is designed for professional level players.
Weight Range: Star:165-175g, Champion:150-175g, DX:150-175g
Best Choice for: Headwind drives, Flex shots, Big hyzers
Available Plastics: Star, Champion, DX