NRG SHIFT KNOB: 230G (TITANIUM ALUMINUM) This product improves the overall look of the interior of the vehicle while providing some performance gain. Different shapes of the knob are ergonomically correct depending on shifting style. Weighted aluminum construction improves shifting by increasing inertial weight in order to allow shifter to more smoothly and quickly engage into the gear box. Features: Weighted Aluminum construction with different designs along with different shift patterns and inserts for various cars. Different weights are also available.