Philips SBCHL145/10 Durable Lightweight Headphones Reinforced cable connectionA soft plastic part on the earshell reduces cablestrain, protects the connection and prevents damagefrom repeated bending. 30 mm speaker driver Compact for wearing comfort yet big enough to deliver crisp, powerful sound, the 30 mm speaker driver is a perfect size for non-distorted listening enjoyment. Bass Beat ventsBass beat vents allow air movement for better soundwith a deep rich bass. Lightweight designThe durable, lightweight quality materials of thesePhilips headphones enhance comfort for extendedwearing. A lightweight headphone for long use, with air vents for rich deep sound