Exceptional resonance, projection, and tone duration throughout all dynamic levels best describe these handcrafted timpani. From leading university and symphony orchestras to talented and accomplished timpanists, Ludwig's Professional Symphonic Series have provided players with the kind of performance their reputations rely on. its performing more contemporary works or a traditional repertoire, the Professional 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 in different sizes: 20",23",26" 29" 32". Sold separately.