The Sennheiser CX300 Earbuds are the ideal ear buds for use with portable MP3, CD, MD, DVD players and many other portable devices with 3.5mm headphone sockets. Soft silicone-rubber ear adapters in three different sizes are included to ensure a perfect fit, high wearing comfort and an excellent attenuation of ambient noise. These ear buds, with their in-ear, sound-isolating design, offer powerful, bass-driven stereo performance. Extremely small and lightweight -- they weigh a bit more than an ounce -- the CX300-B will go wherever you take them. Designed in a stylish black finish, the ear buds include a 3.5mm L-shaped plug and 21-inch asymmetrical cable. Sennheiser, an acknowledged world leader in headphone-transducer technology, offers a two-year manufacturer's warranty on the CX300-B.