These "half-in-ear" buds place no pressure on the user's ears. They are ultra-thin, in fact at 13 mm currently the world's thinnest True Wireless Stereo (TWS) earphones. The all-aluminum shell is crafted using a CNC (computer numerical control) machining process, which produces a smooth and sleek finish. The unique coverless design allows you to easily see the status of the earphones.