Features: [Aluminum Belt Diaphragm]: The lightweight and high strength characteristics of aluminum belt enable the diaphragm to respond quickly, thus producing clearer and more detailed high frequency sound. [Good heat conductivity]: aluminum with good heat conductivity, can effectively dissipate heat, maintain the stability of the speaker in the high load state. [High frequency ductility]: Aluminum tape speakers can maintain a lineared response in the higher frequency ranging, making the sound more natural and real. [Low distortion]: Aluminum belt drive units usually have a lower distortion rate, making the sound quality purer and noise interferences resistant. The aerodynamic design improves the sound propagation efficiency and enhances the sensitivity of the overall sound system. Specifications: Material: PI+AL Size:about 88x60mm/3.46x2.36in Use scenario: Can be used in home auditory systems, recording studios, live performances, auditory enthusiasts communication meetings Quantity：1Pair Package Includes: 1pair Square Aluminum Belt Trebled Pneumatic Speakers note: Please allow 1-2cm errors due to manual measurement. Pictures may not reflect actual color due to different monitors.