The HP30 utilizes the same offset cam design as the Iron Cobra Power Glide. The offset cam offers increased power and speed as the beater reaches the end of the stroke. The beater angle can easily be adjusted: a feature usually found only on more expensive pedals. The DS30 beater offers two different sounds: rotating the beater head, you can choose between felt for a softer controlled sound, or plastic for a louder and punchier sound with more attack