When you get an effect pedal for your guitar the knobs have black overs on them ... here is a pic of an effect pedal and the black rubber covers:
http://images.guitarcenter.com/products/optionRegular/MXR/562891.jpg
What are those knob covers for? Is it just packaging? But if so what are they protecting? You can still break the knob off.
http://images.guitarcenter.com/products/optionRegular/MXR/562891.jpg
What are those knob covers for? Is it just packaging? But if so what are they protecting? You can still break the knob off.