Because they are handmade, each shift knob has a unique character, including the wood grain and shape. They can be installed on both manual and automatic transmission vehicles! Note: They cannot be installed on automatic transmission vehicles with a shift knob that has a lock button. To ensure proper installation on any vehicle, we offer a free service to drill holes to match your bolt size. Please provide the "bolt dimensions" for accurate fitting. Material: Zelkova wood 5.0cm sphere - Material: Wood - Color: Natural wood finish - Shape: Sphere - Surface Finish: Smooth and polished Thank you for viewing.