David Clark H10-26 (for helicopters) "The Standard" among noise-attenuating headsets. Extensively engineered, superbly crafted performer. Has all the features pilots want. Flex boom assembly can be adjusted for perfect microphone placement M-7A, the most advanced noise-canceling microphone available. Foam/air-flow pillow headpad automatically adjust to individual head contour Flo-Fit Gel ear seals provide the most comfortable fit Superior noise attenuation (NRR 24dB) Low-profile volume control knob with detent settings