This is a set of 3 replacement sponge parts for the top of the sensor used in Roland electronic drum PDX-8. ● The sponge part of the electronic drum will inevitably deteriorate, making it difficult to transmit force to the sensor effectively. This can lead to problems such as no sound or inability to express subtle nuances. Of course, repairs are available, but they can be expensive, and many people may be struggling with this. If all you need to do is replace the sponge, why not try making it yourself? That's what I did. I use it myself, and it works without any problems. ● The size is approximately 20mm in diameter and 15mm in height, and the material is polyurethane foam. The bottom surface has a groove to prevent the sponge from lifting due to the lead wire. ● To install, carefully peel off the existing sponge, remove any adhesive and dust from the sensor part (this is an important step, as it affects sensitivity if not cleaned properly), and then attach the new sponge. Adjust the sensitivity on the sound source side if necessary, and you're done. ※Notes ● Replacement is at your own risk. This is a handmade product; please refrain from purchasing if you are looking for the exact same performance as the genuine product. Also, we cannot answer inquiries about replacement methods or sound source settings. ● Shipping will be via "Yu-Packet" or "Yu-Packet Post." ● Returns are only accepted if "the product is completely different from the description" or "damaged," so please understand. We look forward to your purchase if you understand the above contents.