Cardas Audio A8 Ear Speakers, in-Ear Headphones Features the world's first Ultra Linear, Contour Field, Dual Magnet Driver - an entirely new dynamic driver with no permeable core, delivering deep bass, strong midrange, and soaring highs. Choose an ear-tip that provides a comfortable fit, and makes a good seal. A small black silicon tip is installed at the factory. This is a popular size / style, and works for many people. Several tips of various styles and materials are included. The A8 Ear Speakers are ready to use out of the box. And like most of the finest products around, they will improve with time. The body of the A8 headphones/ear speakers is machined from billet brass with a Golden Spiral curve, and finished with a rubberized coating. All new spiral standard cable (single-ended, 3.5mm TRS) wraps the conductors around a fiber core, so that the conductors are never stressed when the cable is tugged. Extremely light, flexible, and strong