This kit featuring 4099 CORE+ version ensure the highest sound quality and bring more clarity and details to your music. Classic kit that only contain 4099 CORE+ Loud SPL version mics (6 mV/Pa sensitivity) is available now. The 4099 CORE+ is the next-generation, high-performance instrument microphone. It delivers pristine, natural and undistorted sound with exceptional isolation and off-axis rejection for any live or studio setting. Fitted with MicroLock and a series of upgraded instrument clips, the 4099 CORE+ provides even better stability and flexibility on any type of instrument.