S&S Cycle Billet Head Breathers are crafted from premium 6061 aluminum and anodized in the iconic S&S Blue. Breathers feature a dual O-ring design, ensuring a superior seal in the head, minimizing leaks, and maximizing performance. They also feature a unique Labyrinth design to significantly reduce oil pass-through, keeping your engine running cleaner and smoother with reduced emissions as it burns less oil.