Thank you for viewing! Get 10% off when you purchase with other items!!! This is a great value set that allows you to try out general-purpose round mouse soles made of different materials. They are 6.6mm in diameter and 0.8mm thick. There are 3 types: slide-focused (2nd photo), quietness-focused (3rd photo), and abrasion-resistance-focused (4th photo), with 20 pieces of each, for a total of 60 pieces. The soles in the photos each have a protective film, and there are actually two white ones and one black one. Only the abrasion-resistance-focused model is made of ultra-high molecular weight polyethylene (UPE), which is highly durable, while the other two are made of PTFE, which has low friction. Regular round soles often have a concave center due to the manufacturing process, but these soles have reinforcing material inside and a two-layer structure, so they are designed not to be concave. Please note that a tool for removing the soles is not included. We will ship within 24 hours of purchase. (May not be possible due to personal circumstances) The product will be wrapped in cushioning material and packaged to prevent it from getting wet. Regarding the feel of use: - Used devices - The mouse is Sprime PM1, and I have 4 quietness-focused soles attached to the top and bottom. I use an Artizan NINJA FX Zero X soft mousepad. If you are using a soft mousepad, I recommend attaching 8 or more. If there are too few, the contact area will be small, and the mouse will sink into the mousepad, making it easier to feel friction. The slide-focused ones are the blue ones in the photo. The material is 100% PTFE and slides very well. If you are using a hard mousepad such as glass, the mouse is less likely to sink in even if you reduce the number of soles, so it is recommended to reduce the friction with fewer soles. The quietness-focused ones are a middle ground between the other two. They slide moderately well, and the sliding sound is quieter than the other two. The material is 100% PTFE, and it is recommended for those who use cloth mousepads. The abrasion-resistant ones are the black ones in the photo. The material is 100% UPE, and the sliding is more restrained compared to the other two, so it is recommended for those who prioritize control. Also, it is resistant to abrasion, so it is recommended for those who want to reduce the frequency of sole replacement.