Carved from hinoki cypress wood. When purchasing, please provide the dimensions (1, 2, and 5) of your current hand rest. We will customize it to your desired size. We cannot provide hand rests with screw-type shafts. The dimensions of the hand rest in the photo are as follows: 1. Shaft diameter: 0.5cm 2. Length from the palm contact point to the tip of the shaft: 4.5cm 3. Thickness of the wooden part: 1.1cm 4. Thickness of the white metal part: 0.4cm 5. Shaft length: 3.0cm The black and brown ones in the photo were taken for comparison. A larger hand rest increases the stability of the right hand. Also, some musical instrument stores acknowledge that wooden ones improve the sound quality.