The BDH S1 Sequential Shifter is engineered to replicate the true mechanical sensation of a race-car dog-box gearbox. Featuring the industry-first Dynamic Inertia Mechanism™, the S1 delivers authentic momentum transfer and engagement physics—not just spring tension, but the real inertial kick of genuine sequential selector mechanics. Lifetime Warranty Dynamic Inertia Mechanism™ Dual-Stage Engagement System CNC Aerospace-Grade Billet Aluminium