Made from 7075 T6 aluminum these unique birdcages are the strongest and most innovative cages on the market today. The cages were created to eliminate bind in the birdcage bearings. Bearing bind, created by twist in the birdcage, absorbs horsepower that could be applied to the rear wheels. Eliminating the bind therefore allows for a more efficient transfer of horsepower to the rear wheels. CLICK HERE to learn how to more about using the cages.