This is a 25mm wooden ball designed for use as a trackball! The material is maple. Maple is relatively hard among woods, and is characterized by its smoothness and fine grain. There aren't many 25mm trackball options, so I think this is perfect for those who want something different! I've been using Keyball for a few months now. I've realized that a 25mm trackball is great! However, the only commercially available option is red, and people are trying various 25mm balls for bearings, such as iron balls! Even so, compared to 34mm, there aren't many options available... I do woodworking as a hobby, so I used scraps, saws, and files to simply carve a square shape into a spherical shape, and I tried it on my Keyball39. The appearance and texture were very good! I thought, "This is great!!" My friends also said they wanted one, so I've been making a few. I'd be happy if more people could use them, so I'm slowly producing them! The price is a bit high because it takes a whole day to carve just one, and mass production is not possible... I don't want to burn myself out, so I hope that those who support me will take care of it and use it with care! Also, since this is made by an amateur, there may be an error of about ±0.1mm, so please be aware of that. In the worst case, you may need to slightly shave the trackball case, and some ingenuity may be required to use it. Also, it can be used in a three-point support case with ceramic balls, but as it is wood, the smoothness is not comparable to commercially available products... Also, even though maple is relatively hard, wood is soft, so I have confirmed that it can be dented by the hardness of the ceramic ball when inserting it into the case. Ingenuity is also required when installing it. I recommend a bearing-type trackball case. I'm working quite comfortably with it! If you have any other questions, feel free to comment!