Unchain Drop D tuning in seconds with the EVH D-Tuna System! Gone are the days of having to stop the flow of your set to change tunings or to grab another guitar — just hit the D-Tuna and you'll instantly be in Drop D. Using the D-Tuna is literally as easy as flicking your finger. This ingenious device was made to retrofit most Floyd Rose-style tremolos in minutes. Of course, Edward Van Halen used the D-Tuna on his axes for years with great success!