Brand newColor: BlackMaterial:Aluminum Covered with Real Carbon Fiber Material for the Best Interior AppearanceInsertion Port Diameter: 0.55" 14 mmProfessional Installer is Highly Recommended (No Instruction Included)Feature:Upgrades the interior of your car with style and functionality with this NRG shift knob. This item is perfect for replacing old， worn out or torn OE shift knobs. Weighted aluminum construction for improving shifting efficiency by increasing inertial force， in order to enhance shifting more smoothly and quickly while shift knob is engaging into the gear box.Package:1 x Shift Knob3 x Different size adapter