PRODUCT INTRODUCTION: Xiaomi Mi In-ear Earphones Basic (Fresh Edition) adopts the third generation damping balance system, optimizes the three-frequency performance, and provides the clear and pure sound for you. We used the same movable piston design found in all In-Ear Headphones for the sound chamber. Made from strengthened polycarbonate for lighter weight and enhanced comfort, without compromising the structure of the sound chamber. Press play and let the powerful bass amaze you. The voice coil is the heart of your headphones, and we have chosen the high-strength, pure copper ones for faster transient response and extended sound-element life. Sound waves produced in headphones reflect back onto the diaphragm, compromising sound quality. By absorbing unwanted, reflected waves, the damping system enhances your music by delivering a clearer sound. The Mi In-Ear Headphones have cables covered with TPE and made of Kevlar fibers—the same kinds used in bulletproof vests. The high-quality cables feature enhanced strength and resistance to breaking and kinking. Its smooth surface resists tangling.