Philips SBCHL145/00 headphones/headset Head-band:   Reinforced cable connection ensures extra durabilityA soft plastic part on the ear shell reduces cable strain, protects the connection and prevents damage from repeated bending.30 mm speaker driver delivers big sound performanceCompact for wearing comfort, yet big enough to deliver crisp, powerful sound, the 30 mm speaker driver is the perfect size for non-distorted listening enjoyment.Bass beat vents allow air movement for better soundBass beat vents allow air movement for better sound with a deep, rich bass.Lightweight design improves comfort for prolonged use.The durable, lightweight quality materials of these Philips headphones enhance comfort for extended wear.