Direct from Play.com so this will be a genuine Sennheiser.
There are many fakes floating around.
CX 300-II Precision Black, high quality ear canal & noise isolating headphones. Extremely small, comfortable, lightweight & discreet.
The CX 300-II Precision Black are high quality, noise-isolating ear-canal-earphones with a powerful, bass-driven stereo sound for listening on the go. They also feature a convenient carrying pouch and an ear adaptor set (S/M/L) to ensure a perfect, individual fit The sound quality has been much improved over the original CX 300.