This is a shift knob made from a laminated wood composed of nine layers: Keyaki (Zelkova), Buna (Beech), Keyaki, Buna, Karin (Quince), Buna, Keyaki, Buna, and Keyaki, from top to bottom. The laminated wood is constructed by alternating the grain direction of each piece by 90° to enhance the beauty of the wood grain. As a result, the color appears to change depending on the viewing angle. The manufacturing process requires a lot of steps and effort, so the price is set a bit higher. The finish is a natural wax finish. The thread size of the mounting part of this shift knob is 12 x 1.25mm, but it can also be installed if your thread size is 10x1.25, 10x1.5, 8x1.25, 6x1.0mm, or 12x1.75mm by using the separately sold diameter conversion adapter below. << Diameter Conversion Adapter Sizes (Sold Separately) >> ① 12x1.25mm (Knob Side) → 8x1.25mm (Lever Side) ② 12x1.25mm (Knob Side) → 10x1.5mm (Lever Side) ③ 12x1.25mm (Knob Side) → 10x1.25mm (Lever Side) ④ 12x1.25mm (Knob Side) → 6x1.0mm (Lever Side) ⑤ 12x1.25mm (Knob Side) → 12x1.75mm (Lever Side) (← This adapter will be 23mm longer) 《 Delivery Method 》 Free shipping, but it will be sent via regular mail (Teikeigai-yubin). 《 Other Custom Orders 》 We also accept custom orders for sizes and materials according to your requests. Please contact us for a quote. If you are interested, please feel free to contact us through the "Wood Studio Craft Miya" website's inquiry form. (Please note that communication regarding other products is prohibited in the comments section of this product.)