Dark Knob PSD ~ Here is a knob that'll help you in your interface design. It's full layered & comes in 3 states so that you have also the interaction designed. you can use it as an interface piece OR as an icon.
Based on the five senses of touch (turn,pull, overturn,push,press) the button series were developed. The significant feature of the series are the behavior of the edges. They step out distinctive at one spot and depart at another spot into eternity.