CX 550 Ear Canal Headphones by Sennheiser Highly-advanced dynamic speaker systems with Neodymium magnets provide an exceptional natural sound experience Personalised fit in the ear canals due to ergonomic design and different sizes of ear adapters (included in delivery) Excellent passive attenuation of ambient noise Smoothly brushed metal parts accentuate the unique design of the CX 550 Style II Perfect for use with remote controls: short cable