GigNobz are just like any other instrument knob. They mount in place of your existing knobs so no modification is ever made to your instrument. No fuss, no hassles and provides an amazing visual effect to your guitar. The knobs come in three types; Gold, Silver, and Black. The personality modules come in several types; Morphing lights, ruby red blinking, cobalt blue blinking, and yellow/orange blink. The personality module simply plugs into the GigNob so you can change the look of your guitar on the fly depending on which types of personality modules you have. For more information please email - [email protected]