This is a shift knob made from solid, carved-out wood of precious Jindai Zelkova (Japanese Zelkova). <<What is Jindai Zelkova?>> Jindai Zelkova is Zelkova wood that has been buried underground for over 1,000 years due to volcanic eruptions or landslides, and preserved without rotting in an environment with little oxygen. Due to the influence of the components in the ground, it is a very valuable material that has changed to a beautiful deep green or dark brown color (a color with a sense of weight). It is also harder than regular Zelkova and is a very dense wood. The finish is natural wax. Please check the thread size on the lever side before purchasing. The thread size of the mounting part of this shift knob is 12 x 1.25mm. If your thread size is 10x1.25, 10x1.5, 8x1.25, 6x1.0mm, or 12x1.75mm, it can be installed using the following optional diameter conversion adapter. <<Diameter Conversion Adapter Sizes (sold separately)>> ① 12x1.25mm (knob side) → 8 x 1.25mm (lever side) ② 12x1.25mm (knob side) → 10 x 1.5mm (lever side) ③ 12x1.25mm (knob side) → 10 x 1.25mm (lever side) ④ 12x1.25mm (knob side) → 6 x 1.0mm (lever side) ⑤ 12x1.25mm (knob side) → 12 x 1.75mm (lever side) (←This adapter will be 23mm longer) <<Delivery Method>> Free shipping, but it will be sent by regular mail (teikeigai-yubin). <<Other Custom-Made Products>> If you would like a custom-made product with your desired size and materials, please contact "Kikoubou Craft Miya" through their HP inquiry form. We will first provide an estimate, so please feel free to contact us. (Please note that exchanging messages about other products in the comment section of this product is prohibited by Mercari's rules.)