The Soniq KABOOM! Headphone/Earphone Combo Pack (Silver) incorporates specially tuned 40 mm drivers with a dynamic frequency response range of 18 Hz to 22 KHz for improved separation of sound, crisp highs, clear midrange and deep booming bass. In addition, Soniq KABOOM! headphones were designed with a compact, folding design that allows for easier storage and transportation. They are constructed of high impact plastic for comfortable feel, strength and durability.