This is an upgrade cable optimized for SHURE earphones (MMCX, so it can be used with other brands as well). High-quality wires are used, which not only improves sound transmission but also makes the cable itself flexible and very easy to use. The length is 1.2m. The following is my personal impression, as I handle many SHURE products. When I listened to SHURE's higher-end models, I felt an enhanced high-frequency range, like a spray of water. If I were to compare it to a pre-made product, it would be similar to NOBUNAGA Labs. The models I used for testing were the SE215 and SE846, and I felt the same tendency with both. Re-cabling can often be expensive, but with this much change at this price, I think it's a very cost-effective product. Immediate purchase is OK. The product is new and unused.