The Crusher d B Koston w/ Mic Headphones from Skullcandy Sensation 55 Driver: The Sensation 55 is our patent-pending bass extension driver. Through this driver, the Crusher delivers a powerful & realistic bass experience that transforms your audio into bass you can feel. REX40 Driver: Our custom-tuned REX40 driver is the keystone of Supreme Sound. Acoustical Porting Built-in Amplifier Adjustable Bass Control Auto-On/ Off Smart Circuit Ergonomic Design Soft Touch Leather Ear Pillows Stashable Detachable Cable In-line Mic 1 Remote