Shure SRH840 Professional Monitoring HeadphonesProfessional Monitoring Headphones Designed for professional audio engineers and musicians, the SRH840 Professional Monitoring Headphones from Shure are optimized for studio recording and critical listening. Neodymium dynamic drivers are tuned to deliver a precisely tailored frequency response with rich bass, clear mid range and extended highs combine with total comfort and durability to provide the ultimate listening experience. . 40 mm neodymium