With 15mm speakers, these earbud headphones are valued for the bass sound. Ergonomics design with slim rubberized caps for long hours of comfort listening. Small enough for optimum wearing comfort and big enough to deliver crisp, non-distorted sound, the 15mm speaker driver is an ideal size for listening enjoyment. Slim cap is ergonomically designed according to the anatomy of the human ear canal. It fits in the ear securely and comfortablye for earbud lovers. Neodynium 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. Large speakers for extra bass. With 15mm speakers, these earbud headphones are valued for the bass sound. Ergonomic design with slim rubberized caps for long hours of listening comfort.