Skullcandy Uprock Headphones - Black / Black 5-7 Day Delivery. Skullcandy Uprock Headphones at AltSkate.co.uk Low profile on-ear designs ensures a close to the head fit Attacking Bass, Natural Vocals, and Precision Highs Impedence - 32 ohms, Sound Pressure Level - 106 dB (1mW/500Hz)