Available in charcoal or white, the PI7 earpieces and case have a rich, luxurious look and feel. The outer panels of the earpieces are circular, with a metallic touch-sensitive surface, while the rest is matte plastic, with silicone eartips. Bowers & Wilkins includes three pairs of eartips in small, medium, and large sizes. The in-canal fit is secure and doesn’t rely on extra pieces like earfins to keep things stable. Internally, the earpieces house a 9.2mm dynamic driver and a single balanced armature driver for the higher frequencies. Both drivers get their own amplifier and work together to deliver a frequency range of 10Hz to 20kHz. Each earpiece also houses three mics for the noise cancellation circuitry.