Group 1 - The company has achieved a breakthrough in high-precision acoustic membrane technology, establishing independent Chinese technology in this field and positioning itself as a leading international supplier of materials for well-known headphone brands [2] - Acoustic membranes are the core material responsible for sound production in headphones, capable of generating different amplitudes of deformation when driven by electric current, thus influencing various acoustic parameters such as vibration mass, transient response, distortion, and frequency response [2] - The company's acoustic membranes have surpassed foreign counterparts in key technical indicators and have already been integrated into high-end Apple headphone products through sales to GoerTek [2]