Moshi Vortex Premium In-Ear Headphones for Kindle Fire HD Offers a premium sound experience for your Kindle Fire or Kindle Fire HD RigidBody steel alloy construction delivers deep, clean bass High definition HR8 neodymium drivers with extended range (10 Hz-20kHz / -10dB@1kHz) Braided ultra-light weight cable with integrated omnidirectional MEMS microphone Custom silicone carrying case with cable management