Usually 3-5 Days. Whether its performing more contemporary works or a traditional repertoire, the Professional Symphonic Series offers a sixth in range for maximum playability. This includes the ease of fine tuning the balance of your timpani simply by turning the tension knob conveniently located just beneath the kettle for quick, minor adjustments that wont interrupt your performance. Available sizes: 20", 23", 26", 29" & 32", with or without gauges.