Adams Revolution Timpani have a number of patented developments that combine truly professional performance sound quality with an innovative balanced action pedal system, height adjustment system, wide range hand fine-tuner, and a removable, folding base for true portability. For the first time since the introduction of the popular Balance Action Spring Pedal mechanism, calf heads can be used on a timpani with this system. An octave can be achieved from each drum with the range tuner. There has never been a more practical, portable, high-quality instrument.