This is a hand-carved hand rest made from Japanese cypress (hinoki) wood. The two below are placed side-by-side for comparison. The color of the rounded head is whiter because it's made from pieces of hinoki wood glued together. The shaft diameter is 4mm, but 5mm shafts are also available. When purchasing, please specify the shaft diameter and the length from the palm rest to the tip of the shaft. We will customize it to your desired length before shipping. The larger hand rest provides increased stability for your right hand. Please give it a try.