New Billet Head Breathers for your 1999-2017 big twin from S&S Cycle. Crafted from premium 6061 aluminum and anodized in the iconic S&S blue, they look good and perform even better. Inside you will find our proprietary Labyrinth design to significantly reduce oil pass-through, keeping your engine running cleaner. Billet construction provides a superior seal in the head, minimizing leaks, and maximizing performance over stock plastic units.