QUIETS VERY NOISY HELICOPTER COCKPITS David Clark H10-56 is designed with the helicopter pilot in mind. Rugged construction and excellent noise attenuation combine to make it our highest performing standard helicopter headset-even in extremely noisy helicopters. Hearing protection is ensured with a 27 dB Noise Reduction Rating. David Clark Company brings all its comfort design features to the helicopter cockpit. If you fly in extremely noisy helicopters, the H10-56 is for you. NSN 5965-01-330-4042 Soft, air-flow headpad and gel-filled ear seals Hinged wire boom for perfect microphone placement M-101 Amplified Dynamic Microphone for safe, clear communication 5' coil cord with U-174/U plug Conforms to MIL-M-26542/4 Certified Noise Reduction Rating (NRR) of 27 dB Helicopter Headsets: H10-13H H20-16 HI0-60H H10-36 H10-26