15 mm speaker driver Small enough for optimum wearing comfort and big enough to deliver crisp, non-distorted sound, the 15 mm speaker driver is an ideal size for listening enjoyment. Bass Beat vents Bass beat vents allow air movement for better sound with a deep, rich bass. Neodymium magnet Neodymium is the best material for producing a strong magnetic field for greater sensitivity in a voice coil, better bass response and higher overall sound quality. Slim cap ear bud design The slim cap is ergonomically designed according to the anatomy of the human ear canal. It fits in the ear securely and comfortably for ear bud lovers. Flexi-Grip design A soft, flexible part protects the cable connection from damage that otherwise would occur due to repeated bending.