Adams Symphonic 20" Generation II copper kettles timpani, Adams Copper Bowls are press formed to maintain even thickness throughout the kettle, Kettle is suspended by means of a strong and firm, contoured steel ring to maintain roundness and ensure stability during transport, three wheels, two at the rear and one under the pedal mechanism, have been custom designed with a braking mechanism that prevents them from both turning and from rotating, the Fine Tuner mechanism on all Symphonic Series Timpani is con-veniently located to the players side and offers an extremely fluid